Question 1: Palette 1/398

Errorless NEET 2024 MCQ

Arrange the following elements in increasing order of electronegativity N, O, F, C, Si Choose the correct answer from the options given below

A

Si < C < N < O < F

B

Si < C < O < N < F

C

O < F < N < C < Si

D

F < O < N < C < Si

Question 2: Palette 2/398

Errorless NEET 2024 MCQ

Arrange the following elements in increasing order of first ionization enthalpy Li, Be, B, C, N. Choose the correct answer from the options given below

A

Li < Be < B < C < N

B

Li < Be > B < C < N

C

Li < Be < C < B < N

D

Li < Be < N < B < C

Question 3: Palette 3/398

Errorless JEE (Main) 2023 MCQ

Which of the following represents the correct order of metallic character of the given elements

A

Si < Be < Mg < K

B

Be < Si < Mg < K

C

K < Mg < Be < Si

D

Be < Si < K < Mg

Question 4: Palette 4/398

Errorless JEE (Main) 2023 MCQ

The correct order of hydration enthalpies is
(A) $K^{+}$ (B) $Rb^{+}$ (C) $Mg^{2+}$ (D) $Cs^{+}$ (E) $Ca^{2+}$
Choose the correct answer from the options given below

A

$C > A > E > B > D$

B

$E > C > A > B > D$

C

$C > E > A > D > B$

D

$C > E > A > B > D$

Question 5: Palette 5/398

Errorless JEE (Main) 2023 MCQ

The correct increasing order of the ionic radii is

A

$Cl^{-} < Ca^{2+} < K^{+} < S^{2-}$

B

$K^{+} < S^{2-} < Ca^{2+} < Cl^{-}$

C

$S^{2-} < Cl^{-} < Ca^{2+} < K^{+}$

D

$Ca^{2+} < K^{+} < Cl^{-} < S^{2-}$

Question 6: Palette 6/398

Errorless JEE (Main) 2022 MCQ

Given below are the oxides $Na_{2}O, As_{2}O_{3}, N_{2}O, NO$ and $Cl_{2}O_{7}$ Number of amphoteric oxides is

A

0

B

1

C

2

D

3

Question 7: Palette 7/398

Errorless JEE (Main) 2022 MCQ

The correct order of electron gain enthalpies of Cl, F, Te and Po is

A

F < Cl < Te < Po

B

Po < Te < F < Cl

C

Te < Po < Cl < F

D

Cl < F < Te < Po

Question 8: Palette 8/398

Errorless JEE (Main) 2022 MCQ

Which of the following elements in considered as a metalloid

A

Sc

B

Pb

C

Bi

D

Te

Question 9: Palette 9/398

Errorless JEE (Main) 2022 MCQ

The correct order of increasing ionic radii is

A

$Mg^{2+} < Na^{+} < F^{-} < O^{2-} < N^{3-}$

B

$N^{3+} < O^{2-} < F^{-} < Na^{+} < Mg^{2+}$

C

$F^{-} < Na^{+} < O^{2-} < Mg^{2+} < N^{3-}$

D

$Na^{+} < F^{-} < Mg^{2+} < O^{2-} < N^{3-}$

Question 10: Palette 10/398

Errorless JEE (Main) 2022 MCQ

Element “E” belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above ‘E’ in the group is

A

$3s^{2}3p^{4}$

B

$3d^{10}4s^{2}4p^{4}$

C

$4d^{10}5s^{2}5p^{4}$

D

$2s^{2}p^{4}$

Question 11: Palette 11/398

Errorless JEE (Main) 2022 MCQ

Given below are two statements: Statement I : The pentavalent oxide of group 15 element $E_{2}O_{5}$ is less acidic than trivalent oxide $E_{2}O_{3}$ of the same element. Statement II : The acidic character of trivalent oxide of group 15 elements $E_{2}O_{3}$ decreases down the group. In light of the above statements choose most appropriate answer from the options given below

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 12: Palette 12/398

Errorless JEE (Main) 2022 MCQ

Among the following basic oxide is

A

$SO_{3}$

B

$SiO_{2}$

C

CaO

D

$Al_{2}O_{3}$

Question 13: Palette 13/398

Errorless JEE (Main) 2022 MCQ

The electronic configuration of Pt (atomic number 78) is

A

$[Xe]4f^{14}5d^{9}6s^{1}$

B

$[Kr]4f^{14}5d^{10}$

C

$[Xe]4f^{14}5d^{10}$

D

$[Xe]4f^{14}5d^{8}6s^{2}$

Question 14: Palette 14/398

Errorless JEE (Main) 2022 MCQ

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct answer from the options given below

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 15: Palette 15/398

Errorless JEE (Main) 2022 MCQ

The IUPAC nomenclature of an element with electronic configuration $[Rn]5f^{14}6d^{17}s^2$ is

A

Unnilbium

B

Unnilunium

C

Unnilquadium

D

Unniltrium

Question 16: Palette 16/398

Errorless JEE (Main) 2022 MCQ

The correct order of density is

A

Be > Mg > Ca > Sr

B

Sr > Ca > Mg > Be

C

Sr > Be > Mg > Ca

D

Be > Sr > Mg > Ca

Question 17: Palette 17/398

Errorless JEE (Main) 2022 MCQ

The total number of acidic oxides from the following Column is: NO, $N_{2}O$ , $B_{2}O_{3}$ , $N_{2}O_{5}$ , CO, $SO_{3}$ , $P_{4}O_{10}$

A

3

B

4

C

5

D

6

Question 18: Palette 18/398

Errorless JEE (Main) 2022 MCQ

The metal that has very low melting point and its periodic position is closer to a metalloid is

A

Al

B

Ga

C

Se

D

In

Question 19: Palette 19/398

Errorless JEE (Main) 2022 MCQ

Outermost electronic configurations of four elements A, B, C, D are given below
(A) $3s^{2}$ (B) $3s^{2}3p^{1}$ (C) $3s^{2}3p^{3}$ (D) $3s^{2}3p^{4}$
The correct order of first ionization enthalpy for them is

A

$(\mathrm{A}) < (\mathrm{B}) < (\mathrm{C}) < (\mathrm{D})$

B

$(\mathrm{B}) < (\mathrm{A}) < (\mathrm{D}) < (\mathrm{C})$

C

$(\mathrm{B}) < (\mathrm{D}) < (\mathrm{A}) < (\mathrm{C})$

D

$(\mathrm{B}) < (\mathrm{A}) < (\mathrm{C}) < (\mathrm{D})$

Question 20: Palette 20/398

Errorless JEE (Main) 2022 MCQ

An element A of group 1 shows similarity to an element B belonging to group 2. If A has maximum hydration enthalpy in group 1 then B is

A

Mg

B

Be

C

Ca

D

Sr

Question 21: Palette 21/398

Errorless JEE (Main) 2022 MCQ

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical A) Rb and Cs B) Na and K C) Ar and Kr(D) I and At Choose the correct answer from the options given below

A

A and B only

B

B and C only

C

A and C only

D

C and D only

Question 22: Palette 22/398

Errorless JEE (Main) 2022 MCQ

The correct decreasing order for metallic character is

A

Na > Mg > Be > Si > P

B

P > Si > Be > Mg > Na

C

Si > P > Be > Na > Mg

D

Be > Na > Mg > Si > P

Question 23: Palette 23/398

Errorless JEE (Main) 2022 MCQ

The first ionization enthalpy of Na, Mg and Si respectively, are : 496, 737 and 786 kJ mol $^{-1}$ . The first ionization enthalpy (kJ mol $^{-1}$ ) of Al is

A

487

B

768

C

577

D

856

Question 24: Palette 24/398

Errorless NEET 2022 MCQ

The IUPAC name of an element with atomic number 119 is

A

unununnium

B

ununoctium

C

ununennium

D

unnilennium

Question 25: Palette 25/398

Errorless JEE (Main) 2021 MCQ

What is the correct order of the following elements with respect to their density

A

$Cr < Zn < Co < Cu < Fe$

B

$Zn < Cu < Co < Fe < Cr$

C

$Zn < Cr < Fe < Co < Cu$

D

$Cr < Fe < Co < Cu < Zn$

Question 26: Palette 26/398

Errorless JEE (Main) 2021 MCQ

The incorrect statement among the following is

A

$VOSO_4$ is a reducing agent

B

$Cr_2O_3$ is an amphoteric oxide

C

$RuO_4$ is an oxidizing agent

D

Red colour of ruby is due to the presence of $Co^{3+}$

Question 27: Palette 27/398

Errorless JEE (Main) 2021 MCQ

The correct order of bond dissociation enthalpy of halogens is

A

$Cl_{2} > F_{2} > Br_{2} > I_{2}$

B

$I_{2} > Br_{2} > Cl_{2} > F_{2}$

C

$Cl_{2} > Br_{2} > F_{2} > I_{2}$

D

$F_{2} > Cl_{2} > Br_{2} > I_{2}$

Question 28: Palette 28/398

Errorless JEE (Main) 2021 MCQ

Match Column - I(Electronic configuration of elements) with Column - II(Δᵢ in kJ mol⁻¹)
Choose the most appropriate answer from the options given below

Column-I	Column-II
(P) 1s² 2s² (Q) 1s² 2s² 2p⁴ (R) 1s² 2s² 2p³ (S) 1s² 2s² 2p¹	(I) 801 (II) 899 (III) 1314 (IV) 1402

A

P - II, Q - III, R - IV, S - I

B

P - I, Q - IV, R - III, S - II

C

P - I, Q - III, R - IV, S - II

D

P - IV, Q - I, R - II, S - III

Question 29: Palette 29/398

Errorless JEE (Main) 2021 MCQ

The correct order of electron gain enthalpy is

A

$S > Se > Te > O$

B

$Te > Se > S > O$

C

$O > S > Se > Te$

D

$S > O > Se > Te$

Question 30: Palette 30/398

Errorless JEE (Main) 2021 MCQ

Identify the elements X and Y using the ionization energy values given below

	Ionization energy	(kJ/mol)
	$1^{st}$	$2^{nd}$
X	495	4563
Y	731	1450

A

$X = Na;Y = Mg$

B

$X = Mg;Y = F$

C

$X = Mg;Y = Na$

D

$X = F;Y = Mg$

Question 31: Palette 31/398

Errorless JEE (Main) 2021 MCQ

The characteristics of elements X, Y and Z with atomic numbers, 33, 53 and 83 respectively are

A

$X$ and $Y$ are metalloids and $Z$ is a metal

B

$X$ is a metalloid, $Y$ is a non-metal and $Z$ is a metal

C

$X, Y$ and $Z$ are metals

D

$X$ and $Z$ are non-metals and $Y$ is a metalloid

Question 32: Palette 32/398

Errorless JEE (Main) 2021 MCQ

The absolute value of the electron gain enthalpy of halogens satisfies

A

$I > Br > Cl > F$

B

$Cl > Br > F > I$

C

$Cl > F > Br > I$

D

$F > Cl > Br > I$

Question 33: Palette 33/398

Errorless JEE (Main) 2021 MCQ

The ionic radius of $Na^{+}$ ions is 1.02 Å. The ionic radii (in Å) of $Mg^{2+}$ and $Al^{3+}$ , respectively, are

A

1.05 and 0.99

B

0.72 and 0.54

C

0.85 and 0.99

D

0.68 and 0.72

Question 34: Palette 34/398

Errorless JEE (Main) 2021 MCQ

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z, the elements X,Y and Z, respectively, are

A

Chlorine, lithium and sodium

B

Argon, lithium and sodium

C

Argon. chlorine and sodium

D

Neon, sodium and chlorine

Question 35: Palette 35/398

Errorless JEE (Main) 2021 MCQ

Which one of the following statements for D.I. Mendeleeff, is incorrect

A

He authored the textbook – Principles of Chemistry

B

At the time, he proposed Periodic Table of elements structure of atom was known

C

Element with atomic number 101 is named after him

D

He invented accurate barometer

Question 36: Palette 36/398

Errorless JEE (Main) 2021 MCQ

The ionic radii of $K^{+}, Na^{+}, Al^{3+}$ and $Mg^{2+}$ are in the order

A

$Na^{+} < K^{+} < Mg^{2+} < Al^{3+}$

B

$Al^{3+} < Mg^{2+} < K^{+} < Na^{+}$

C

$Al^{3+} < Mg^{2+} < Na^{+} < K^{+}$

D

$K^{+} < Al^{3+} < Mg^{2+} < Na^{+}$

Question 37: Palette 37/398

Errorless JEE (Main) 2021 MCQ

The correct order of first ionization enthalpy is

A

Mg < S < Al < P

B

Mg < Al < S < P

C

Al < Mg < S < P

D

Mg < Al < P < S

Question 38: Palette 38/398

Errorless JEE (Main) 2021 MCQ

The correct order of ionic radii for the ions, $P^{3-}, S^{2-}, Ca^{2+}, K^+, Cl^-$ is

A

$P^{3-} > S^2 > Cl^- > K^+ > Ca^{2+}$

B

$P^{3-} > S^2 > Cl^- > Ca^{2+} > K^+$

C

$Cl^- > S^2 > P^{3-} > Ca^{2+} > K^+$

D

$K^+ > Ca^{2+} > P^{3-} > S^{2-} > Cl^-$

Question 39: Palette 39/398

Errorless JEE (Main) 2021 MCQ

Given below are two statements: one is labeled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Barium carbonate is insoluble in water and is highly stable.
Reason (R) : The thermal stability of the carbonates increases with cationic size.
Choose the most appropriate answer from the options given below

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 40: Palette 40/398

Errorless JEE (Main) 2021 MCQ

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason (R) : It is due to increase in ionization enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements,
choose the most appropriate answer from the options given below :

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 41: Palette 41/398

Errorless JEE (Main) 2021 MCQ

Which one of the following correctly represents the order of stability oxides $X_{2}O$ ; (X-halogen)

A

Br > I > Cl

B

I > Cl > Br

C

Br > Cl > I

D

Cl > I > Br

Question 42: Palette 42/398

Errorless NEET 2021 MCQ

$Zr(Z = 40)$ and $Hf(Z = 72)$ have similar atomic and ionic radii because of

A

Diagonal relationship

B

Lanthanoid contraction

C

Having similar chemical properties

D

Belonging to same group

Question 43: Palette 43/398

Errorless NEET 2021 MCQ

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it

A

$H_{2}O < H_{2}S < H_{2}Se < H_{2}Te$ : Increasing $pK_{a}$ values

B

$NH_{3} < PH_{3} < AsH_{3} < SbH_{3}$ : Increasing acidic character

C

$CO_{2} < SiO_{2} < SnO_{2} < PbO_{2}$ : Increasing oxidizing power

D

HF < HCl < HBr < HI : Increasing acidic strength

Question 44: Palette 44/398

Errorless JEE (Main) 2020 MCQ

The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively are

A

-333, -349, -325 and -296

B

-296, -325, -333 and -349

C

-333, -325, -349 and -296

D

-349, -333, -325 and -296

Question 45: Palette 45/398

Errorless JEE (Main) 2020 MCQ

With in each pair of elements of $F$ and $Cl$ , $S$ and $Se$ , and $Li$ and $Na$ , respectively, the elements that release more energy upon an electron gain are

A

$F$ , $Se$ and $Na$

B

$F$ , $S$ and $Li$

C

$Cl$ , $S$ and $Li$

D

$Cl$ , $Se$ and $Na$

Question 46: Palette 46/398

Errorless JEE (Main) 2020 MCQ

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are

A

496, 737, 577, 786

B

786, 737, 577, 496

C

496, 577, 737, 786

D

496, 577, 786, 737

Question 47: Palette 47/398

Errorless JEE (Main) 2020 MCQ

The third ionization enthalpy is minimum for

A

Fe

B

Ni

C

Co

D

Mn

Question 48: Palette 48/398

Errorless JEE (Main) 2020 MCQ

The increasing order of the atomic radii of the following elements is

A

C

B

O

C

F

D

Cl

Question 49: Palette 49/398

Errorless JEE (Main) 2020 MCQ

B has a smaller first ionization enthalpy than Be. Consider the following statements
(I) It is easier to remove 2p electron than 2s electron.
(II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be.
(III) 2s electron has more penetration power than 2p electron
(IV) Atomic radius of B is more than Be.
(Atomic number B = 5, Be = 4)
The correct statements are

A

(I), (II) and (III)

B

(II), (III) and (IV)

C

(I), (III) and (IV)

D

(I), (II) and (IV)

Question 50: Palette 50/398

Errorless JEE (Main) 2020 MCQ

The first and second ionization enthalpies of a metal are 496 and $4560\mathrm{kJ mol}^{-1}$ , respectively. How many moles of HCl and $\mathsf{H}_2\mathsf{SO}_4$ , respectively, will be needed to react completely with 1 mole of the metal hydroxide

A

1 and 0.5

B

2 and 0.5

C

1 and 1

D

1 and 2

Question 51: Palette 51/398

Errorless JEE (Main) 2020 MCQ

In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is

A

Electronegativity

B

Electron gain enthalpy

C

Ionization enthalpy

D

Atomic radius

Question 52: Palette 52/398

Errorless JEE (Main) 2020 MCQ

Three elements X, Y and Z are in the $3^{rd}$ period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is

A

X < Y < Z

B

Z < Y < X

C

X < Z < Y

D

Y < X < Z

Question 53: Palette 53/398

Errorless JEE (Main) 2020 MCQ

The atomic number of the element unnilennium is

A

119

B

109

C

108

D

102

Question 54: Palette 54/398

Errorless JEE (Main) 2020 MCQ

The elements with atomic numbers 101 and 104 belong to, respectively

A

Actinoids and Group 4

B

Group 11 and Group 4

C

Group 6 and Actinoids

D

Actinoids and Group 6

Question 55: Palette 55/398

Errorless JEE (Main) 2020 MCQ

The ionic radii of $O^{2-}$ , $F^{-}$ , $Na^{+}$ and $Mg^{2+}$ are in the order

A

$O^{2-} > F^{-} > Na^{+} > Mg^{2+}$

B

$F^{-} > O^{2-} > Na^{+} > Mg^{2+}$

C

$O^{2-} > F^{-} > Mg^{2+} > Na^{+}$

D

$Mg^{2+} > Na^{+} > F^{-} > O^{2-}$

Question 56: Palette 56/398

Errorless JEE (Main) 2020 MCQ

In the sixth period, the orbitals that are filled are

A

$6s,5f,6d,6p$

B

$6s,5d,5f,6p$

C

$6s,6p,6d,6f$

D

$6s,4f,5d,6p$

Question 57: Palette 57/398

Errorless NEET 2020 MCQ

Identify the incorrect match Column-I(Name), Column-II(IUPAC Name)

Column-I	Column-II
(P) Unnilunium (Q) Unniltrium (R) Unnilhexium (S) Unununnium	(I) Mendelevium (II) Lawrencium (III) Seaborgium (IV) Darmstadtium

A

(S), (IV)

B

(P), (I)

C

(Q), (II)

D

(R), (III)

Question 58: Palette 58/398

Errorless NEET 2020 MCQ

Match the following
Which of the following is correct option

Column-I	Column-II
(P) CO (Q) BaO (R) $Al_{2}O_{3}$ (S) $Cl_{2}O_{7}$	(I) Basic (II) Neutral (III) Acidic (IV) Amphoteric

A

p-iv, q-iii, r-ii, s-i

B

p-i, q-ii, r-iii, s-iv

C

p-ii, q-i, r-iv, s-iii

D

p-iii, q-iv, r-i, s-ii

Question 59: Palette 59/398

Errorless JEE (Main) 2019 MCQ

In general, the properties that decrease and increase down a group in the periodic table, respectively, are

A

Electronegativity and electron gain enthalpy

B

Electronegativity and atomic radius

C

Atomic radius and electronegativity

D

Electron gain enthalpy and electronegativity

Question 60: Palette 60/398

Errorless JEE (Main) 2019 MCQ

When the first electron gain enthalpy $(\Delta_{eg}H)$ of oxygen is $-141\mathrm{kJ / mol}$ , its second electron gain enthalpy is

A

Almost the same as that of the first

B

Negative, but less negative than the first

C

A positive value

D

A more negative value than the first

Question 61: Palette 61/398

Errorless JEE (Main) 2019 MCQ

The electronegativity of aluminium is similar to

A

Boron

B

Carbon

C

Lithium

D

Beryllium

Question 62: Palette 62/398

Errorless JEE (Main) 2019 MCQ

The 71 $^{st}$ electron of an element X with an atomic number of 71 enters into the orbital

A

4f

B

6p

C

6s

D

5d

Question 63: Palette 63/398

Errorless JEE (Main) 2019 MCQ

The correct order of the atomic radii of C, Cs, Al and S is

A

S < C < Al < Cs

B

S < C < Cs < Al

C

C < S < Cs < Al

D

C < S < Al < Cs

Question 64: Palette 64/398

Errorless JEE (Main) 2019 MCQ

The amphoteric hydroxide is

A

$Ca(OH)_{2}$

B

$Be(OH)_{2}$

C

$Sr(OH)_{2}$

D

$Mg(OH)_{2}$

Question 65: Palette 65/398

Errorless JEE (Main) 2019 MCQ

The correct option with respect to the Pauling electronegativity values of the elements is

A

Ga < Ge

B

Si < Al

C

P > S

D

Te > Se

Question 66: Palette 66/398

Errorless JEE (Main) 2019 MCQ

The element with $Z = 120$ (not yet discovered) will be an/a

A

Transition metal

B

Inner-transition metal

C

Alkaline earth metal

D

Alkali metal

Question 67: Palette 67/398

Errorless JEE (Main) 2019 MCQ

The correct order of atomic radii is

A

Ce > Eu > Ho > N

B

N > Ce > Eu > Ho

C

Eu > Ce > Ho > N

D

Ho > N > Eu > Ce

Question 68: Palette 68/398

Errorless JEE (Main) 2019 MCQ

The IUPAC symbol for the element with atomic number 119 would be

A

unh

B

uun

C

une

D

uue

Question 69: Palette 69/398

Errorless JEE (Main) 2019 MCQ

The element having greatest difference between its first and second ionization energies, is

A

Ca

B

K

C

Ba

D

Sc

Question 70: Palette 70/398

Errorless JEE (Main) 2019 MCQ

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are

A

16, 5 and 2

B

16, 6 and 3

C

15, 5 and 3

D

15, 6 and 2

Question 71: Palette 71/398

Errorless JEE (Main) 2019 MCQ

The pair that has similar atomic radii is

A

Sc and Ni

B

Ti and HF

C

Mo and W

D

Mn and Re

Question 72: Palette 72/398

Errorless NEET 2019; JEE (Main) 2022 MCQ

For the second period elements the correct increasing order of first ionisation enthalpy is

A

Li < Be < B < C < N < O < F < Ne

B

Li < B < Be < C < O < N < F < Ne

C

Li < B < Be < C < N < O < F < Ne

D

Li < Be < B < C < O < N < F < Ne

Question 73: Palette 73/398

Errorless NEET 2019 MCQ

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

A

$5f > 6p > 5p > 4d$

B

$6p > 5f > 5p > 4d$

C

$6p > 5f > 4d > 5p$

D

$5f > 6p > 4d > 5p$

Question 74: Palette 74/398

Errorless NEET 2018 MCQ

The correct order of atomic radii in group 13 elements is

A

B < Al < In < Ga < Tl

B

B < Al < Ga < In < Tl

C

B < Ga < Al < Tl < In

D

B < Ga < Al < In < Tl

Question 75: Palette 75/398

Errorless JEE (Main) 2017 MCQ

The group having isoelectronic species is

A

$O^{-}, F^{-}, Na, Mg^{+}$

B

$O^{2-}, F^{-}, Na, Mg^{2+}$

C

$O^{-}, F^{-}, Na^{+}, Mg^{2+}$

D

$O^{2-}, F^{-}, Na^{+}, Mg^{2+}$

Question 76: Palette 76/398

Errorless AIPMT 2015 MCQ

The number of d-electrons in $Fe^{2+}$ (Z=26) is not equal to the number of electrons in which one of the following

A

p - electrons in Cl (Z=17)

B

d - electrons in Fe (Z=26)

C

p - electrons in Ne (Z=10)

D

s - electrons in Mg (Z=12)

Question 77: Palette 77/398

Errorless JEE (Main) 2015 MCQ

The ionic radii (in Å) of $N^{3-}, O^{2-}$ and $F^{-}$ are respectively

A

1.36, 1.40 and 1.71

B

1.36, 1.71 and 1.40

C

1.71, 1.40 and 1.36

D

1.71, 1.36 and 1.40

Question 78: Palette 78/398

Errorless CBSE PMT 2014; KCET 2018 MCQ

Which of the following orders of ionic radii is correctly represented

A

$F^{-} > O^{2-} > Na^{+}$

B

$Al^{3+} > Mg^{2+} > N^{3-}$

C

$H^{-} > H > H^{+}$

D

$Na^{+} > F^{-} > O^{2-}$

Question 79: Palette 79/398

Errorless NEET (Karnataka) 2013 MCQ

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O

A

Al < Ca < O < C < F

B

Al < O < C < Ca < F

C

C < F < O < Al < Ca

D

Ca < Al < C < O < F

Question 80: Palette 80/398

Errorless MP PET 2013 MCQ

The amount of energy released when $10^{6}$ atoms of iodine in vapour state are converted to $I^{-}$ ions is $4.9 \times 10^{-13} J$ . What will be electron affinity of iodine in eV per atom

A

2.0

B

2.5

C

2.75

D

3.06

Question 81: Palette 81/398

Errorless JEE (Main) 2013 MCQ

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar

A

$Ca < S < Ba < Se < Ar$

B

$S < Se < Ca < Ba < Ar$

C

$Ba < Ca < Se < S < Ar$

D

$Ca < Ba < S < Se < Ar$

Question 82: Palette 82/398

Errorless JEE (Main) 2013 MCQ

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of $Na^{+}$ will be

A

-2.55 eV

B

-5.1 eV

C

-10.2 eV

D

+2.55 eV

Question 83: Palette 83/398

Errorless J & K CET 2012 MCQ

Properties of elements are periodic function of number of present in the nucleus

A

Protons

B

Electrons

C

Neutrons

D

Mesons

Question 84: Palette 84/398

Errorless CBSE PMT (Pre.) 2012 MCQ

Identify the wrong statement in the following

A

Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

B

Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

C

Atomic radius of the elements increases as one moves down the first group of the periodic table

D

Atomic radius of the elements decreases as one moves across from left to right in the $2^{nd}$ period of the periodic table

Question 85: Palette 85/398

Errorless AFMC 2012 MCQ

The correct order of increasing radii of the ions $Br^{-}, F^{-}, O^{2-}$ and $S^{2-}$ is as follows

A

$Br^{-} < F^{-} < O^{2-} < S^{2-}$

B

$S^{2-} < O^{2-} < F^{-} < Br^{-}$

C

$F^{-} < O^{2-} < S^{2-} < Br^{-}$

D

$F^{-} < Br^{-} < O^{2-} < S^{2-}$

Question 86: Palette 86/398

Errorless AMU (Med.) 2012 MCQ

Which of the following is the correct increasing order of the ionic radii

A

$Li^{+} < Mg^{2+} < K^{+} < Al^{3+}$

B

$Al^{3+} < Li^{+} < Mg^{2+} < K^{+}$

C

$Al^{3+} < Mg^{2+} < K^{+} < Li^{+}$

D

$K^{+} < Al^{3+} < Mg^{2+} < Li^{+}$

Question 87: Palette 87/398

Errorless AMU (Med.) 2012 MCQ

The decreasing order of the first ionization energy (in $kJ \, mol^{-1}$ ) of He, Mg and Na is $He > Mg > Na$ . The increasing order of the $2^{nd}$ ionization energy (in $kJ \, mol^{-1}$ ) of these elements will be

A

$Na < Mg < He$

B

$Mg < Na < He$

C

$Mg < He < Na$

D

$Na < He < Mg$

Question 88: Palette 88/398

Errorless Kerala PMT 2012 MCQ

The element with positive electron gain enthalpy is

A

Hydrogen

B

Sodium

C

Oxygen

D

Fluorine

E

Neon

Question 89: Palette 89/398

Errorless J & K CET 2012 MCQ

The most stable oxidation state exhibited by thallium is

A

0

B

+1

C

+2

D

+3

Question 90: Palette 90/398

Errorless WB JEE 2012 MCQ

The stable bivalency of $Pb$ and trivalency of $Bi$ is

A

Due to $d$ contraction in $Pb$ and $Bi$

B

Due to relativistic contraction of the 6s orbitals of $Pb$ and $Bi$ , leading to inert pair effect

C

Due to screening effect

D

Due to attainment of noble configuration

Question 91: Palette 91/398

Errorless Odisha JEE 2012 MCQ

Which of the following is not a periodic property

A

Electronegativity

B

Atomic volume

C

Covalent radii

D

Atomic mass

Question 92: Palette 92/398

Errorless Odisha JEE 2011 MCQ

Which of the following has the largest size

A

$S^{2-}$

B

$Se^{2-}$

C

$O^{2-}$

D

$Te^{2-}$

Question 93: Palette 93/398

Errorless Kerala PET 2011 MCQ

The correct decreasing order of first ionisation enthalpies of five elements of the second period is

A

Be > B > C > N > F

B

N > F > C > B > Be

C

F > N > C > Be > B

D

N > F > B > C > Be

E

F > C > N > B > Be

Question 94: Palette 94/398

Errorless Kerala PMT 2011 MCQ

The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium is

A

(II) > (III) > (I) > (IV)

B

(III) > (IV) > (II) > (I)

C

(I) > (II) > (III) > (IV)

D

(I) > (II) > (IV) > (III)

E

(II) > (III) > (IV) > (I)

Question 95: Palette 95/398

Errorless CBSE PMT (Mains) 2010 MCQ

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

A

Mg < Ca < Cl < P

B

Cl < P < Mg < Ca

C

P < Cl < Ca < Mg

D

Ca < Mg < P < Cl

Question 96: Palette 96/398

Errorless CBSE PMT (Mains) 2010 MCQ

Among the following which one has highest cation to anion size ratio

A

CsI

B

CsF

C

LiF

D

NaF

Question 97: Palette 97/398

Errorless AMU (Engg.) 2010 MCQ

Which of the following sets will have highest hydration enthalpy and highest ionic radius

A

Na and Li

B

Li and Rb

C

K and Na

D

Cs and Na

Question 98: Palette 98/398

Errorless AMU (Med.) 2010 MCQ

Among the following, the third ionisation energy is highest for

A

Magnesium

B

Boron

C

Beryllium

D

Aluminium

Question 99: Palette 99/398

Errorless J & K CET 2010 MCQ

Which element is expected to have lowest first ionisation energy

A

Sr

B

As

C

Xe

D

S

Question 100: Palette 100/398

Errorless KCET 2010 MCQ

Generally, the first ionisation energy increases along a period. But there are some exceptions. One which is NOT an exception is .....

A

N and O

B

Na and Mg

C

Mg and Al

D

Be and B

Question 101: Palette 101/398

Errorless CPMT 2010 MCQ

The chemical elements are arranged in the order of increasing electronegativities in the sequence

A

P, Si, Se, Br, N

B

Si, Se, P, Br, N

C

Si, P, Se, Br, N

D

Se, P, Si, Br, N

Question 102: Palette 102/398

Errorless WB JEE 2010 MCQ

In a periodic table the basic character of oxides

A

Increases from left to right and decreases from top to bottom

B

Decreases from right to left and increases from top to bottom

C

Decreases from left to right and increases from top to bottom

D

Decreases from left to right and increases from bottom to top

Question 103: Palette 103/398

Errorless Kerala PET 2010 MCQ

The first $(\Delta_{i}H_{1})$ and second $(\Delta_{i}H_{2})$ ionisation enthalpies (in $kJ mol^{-1}$ ) and the electron gain enthalpy $(\Delta_{eg}H)$ (in $kJ mol^{-1}$ ) of the elements I, II, III, IV and V are given below

Element	$\Delta_{i}H_{1}$	$\Delta_{i}H_{2}$	$\Delta_{eg}H$
I	520	7300	-60
II	419	3051	-48
III	1681	3374	-328
IV	1008	1846	-295
V	2372	5251	+48

The most reactive metal and the least reactive non-metal of these are respectively

A

I and V

B

V and II

C

II and V

D

IV and V

E

V and III

Question 104: Palette 104/398

Errorless AMU (Engg.) 2009 MCQ

The element with atomic number 117 if discovered would be placed in

A

Noble gas family

B

Alkali family

C

Alkaline earth family

D

Halogen family

Question 105: Palette 105/398

Errorless J & K CET 2009 MCQ

Which one of the following is a 'd-block element'

A

Gd

B

Hs

C

Es

D

Cs

Question 106: Palette 106/398

Errorless DCE 2009 MCQ

Which is not the correct order for the stated property

A

$Ba > Sr > Mg$ : atomic radius

B

$F > O > N$ : first ionisation enthalpy

C

$Cl > F > I$ : electron affinity

D

$O > Se > Te$ : electronegativity

Question 107: Palette 107/398

Errorless Kerala PMT 2008 MCQ

An element $X$ belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of $X$ ? It has

A

Partially filled $d$ orbitals and completely filled $s$ orbitals

B

Completely filled s-orbital and completely filled p-orbitals

C

Completely filled s-orbital and half-filled p-orbitals

D

Half-filled d-orbitals and completely filled s-orbitals

E

Completely filled d, s and p-orbitals

Question 108: Palette 108/398

Errorless Kerala PMT 2008 MCQ

Which one of the ions in the table below would have the largest value of enthalpy of hydration Ionic radius in nm Charge of ion

A

0.0065 +2

B

0.095 +1

C

0.135 +2

D

0.169 +1

E

0.181 -1

Question 109: Palette 109/398

Errorless KCET 2008 MCQ

The correct order in which the first ionisation potential increases is

A

K, Be, Na

B

Be, Na, K

C

Na, K, Be

D

K, Na, Be

Question 110: Palette 110/398

Errorless Kerala PET 2008 MCQ

The electronic configuration of the element with maximum electron affinity is

A

$1s^{2}, 2s^{2}, 2p^{3}$

B

$1s^{2}, 2s^{2}, 2p^{5}$

C

$1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{5}$

D

$1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{3}$

E

$1s^{2}, 2s^{2}, 2p^{6}, 3s^{1}$

Question 111: Palette 111/398

Errorless Kerala PET 2008 MCQ

Match the entries Columned in Column-I with appropriate properties Columned in Column-II.

Column-I	Column-II
(P) He (Q) Cl (R) Ca (S) Li	(I) High electron affinity (II) Most electropositive element (III) Strongest reducing agent (IV) Highest ionization energy

A

p–iii, q–i, r–ii, s–iv

B

p–iv, q–iii, r–ii, s–i

C

p–ii, q–iv, r–i, s–iii

D

p–i, q–ii, r–iii, s–iv

E

p–iv, q–i, r–ii, s–iii

Question 112: Palette 112/398

Errorless Kerala PMT 2008 MCQ

Which two elements in the periodic table would you expect to combine in the most violent fashion

A

H and O

B

Cl and F

C

Mg and N

D

P and O

E

Cs and F

Question 113: Palette 113/398

Errorless MP PMT 2008 MCQ

Which of the following is arranged in order of increasing density

A

$Al < Mg < C_{(\text{graphite})} < B$

B

$B < Al < Mg < C_{(\text{graphite})}$

C

$C_{(\text{graphite})} < Al < B < Mg$

D

$Mg < C_{(\text{graphite})} < B < Al$

Question 114: Palette 114/398

Errorless CBSE PMT 2007; CBSE PMT (Pre.) 2010; WB JEE 2012 MCQ

Identify the correct order of the size of the following

A

$Ca^{2+} < K^{+} < Ar < S^{2-} < Cl^{-}$

B

$Ca^{2+} < K^{+} < Ar < Cl^{-} < S^{2-}$

C

$Ar < Ca^{2+} < K^{+} < Cl^{-} < S^{2-}$

D

$Ca^{2+} < Ar < K^{+} < Cl^{-} < S^{2-}$

Question 115: Palette 115/398

Errorless UPCPMT 2007 MCQ

Difference between $S$ and $S^{2-}$ as $S^{2-}$ has

A

Larger radii and large size

B

Smaller radii and large size

C

Larger radii and small size

D

Smaller radii and small size

Question 116: Palette 116/398

Errorless UPCPMT 2007 MCQ

Increase in atomic size down the group is due to

A

Increase in number of electrons

B

Increase in number of protons and neutrons

C

Increase in number of protons

D

Increase in number of protons, neutrons and electrons

Question 117: Palette 117/398

Errorless CBSE PMT 2007 MCQ

With which of the following electronic configuration an atom has the lowest ionisation enthalpy

A

$1s^{2}2s^{2}2p^{5}$

B

$1s^{2}2s^{2}2p^{3}$

C

$1s^{2}2s^{2}2p^{5}3s^{1}$

D

$1s^{2}2s^{2}2p^{6}$

Question 118: Palette 118/398

Errorless UPCPMT 2007 MCQ

Which of the following has lowest ionisation energy

A

Oxygen

B

Nitrogen

C

Fluorine

D

Sulphur

Question 119: Palette 119/398

Errorless CBSE PMT 2007 MCQ

Which one of the following ionic species has the greatest proton affinity to form stable compound

A

$HS^{-}$

B

$NH_{2}^{-}$

C

$F^{-}$

D

$I^{-}$

Question 120: Palette 120/398

Errorless MP PMT 2007 MCQ

Between $HF, HCl, HBr$ and $HI, HF$ has the highest ionic character because

A

$F$ has the highest electron affinity

B

In $HF$ , electronegativity difference is highest

C

$F^{-}$ ion has the highest value of ionic radius

D

Atomic orbitals of $H$ and $F$ have almost similar energy

Question 121: Palette 121/398

Errorless UPCPMT 2007 MCQ

Which of the following is second most electronegative element

A

Chlorine

B

Oxygen

C

Sulphur

D

Fluorine

Question 122: Palette 122/398

Errorless Kerala PMT 2006 MCQ

Which of the following statements is/are NOT TRUE about the diagonal relationship of Be and Al
(i) Both react with NaOH to liberate hydrogen
(ii) Their oxides are basic
(iii) They are made passive by nitric acid
(iv) Their carbides give acetylene on treatment with water

A

Only (i)

B

(ii) and (iii)

C

Only (iv)

D

(i) and (iv)

E

(ii) and (iv)

Question 123: Palette 123/398

Errorless Kerala PMT 2006 MCQ

The electronic configuration of four elements are (1) $[Xe]6s^{1}$ (2) $[Xe]4f^{14}5d^{1}6s^{2}$ (3) $[Ar]4s^{2}4p^{5}$ (4) $[Ar]3d^{7}4s^{2}$ Which one of the following statements about these elements is NOT correct

A

1 is a strong reducing agent

B

2 is a $d$ -block element

C

3 has high electron affinity

D

4 shows variable oxidation state

E

The compound formed between 1 and 3 is ionic

Question 124: Palette 124/398

Errorless RPMT 2006 MCQ

Which of the following element is a metalloid

A

Bi

B

Sn

C

Ge

D

C

Question 125: Palette 125/398

Errorless AIEEE 2006 MCQ

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture

A

The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

B

In both alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

C

Chemical reactivity increase with increase in atomic number down the group in both the alkali metals and halogens

D

In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Question 126: Palette 126/398

Errorless BHU 2006 MCQ

The ionic radii (Å) of $C^{4-}$ and $O^{2-}$ respectively are 2.60 and 1.40. The ionic radius of the isoelectronic ion $N^{3-}$ would be

A

2.6

B

1.71

C

1.4

D

0.95

Question 127: Palette 127/398

Errorless 2006 MCQ

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is [a] IEEE 2006; AFMC 2012]

A

F < S < P < B

B

P < S < B < F

C

B < P < S < F

D

B < S < P < F

Question 128: Palette 128/398

Errorless Kerala PET 2006 MCQ

The successive ionisation energy values for an element $X$ are given below A. $1^{\mathrm{st}}$ ionisation energy $= 410 \mathrm{~kJ} \mathrm{mol}^{-1}$ B. $2^{\mathrm{nd}}$ ionisation energy $= 820 \mathrm{~kJ} \mathrm{mol}^{-1}$ C. $3^{\mathrm{rd}}$ ionisation energy $= 1100 \mathrm{~kJ} \mathrm{mol}^{-1}$ D. $4^{\mathrm{th}}$ ionisation energy $= 1500 \mathrm{~kJ} \mathrm{mol}^{-1}$ E. $5^{\mathrm{th}}$ ionisation energy $= 3200 \mathrm{~kJ} \mathrm{mol}^{-1}$ Find out the number of valence electron for the atom, X

A

4

B

3

C

5

D

2

E

1

Question 129: Palette 129/398

Errorless Kerala PMT 2006 MCQ

Among the following transition elements, pick out the element / elements with highest second ionisation energy
(A) V (At. no = 23)
(B) Cr (At. no. = 24)
(C) Mn (At. no = 25)
(D) Cu (At. no = 29)
(E) Zn (At. no = 30)

A

(A) and (C)

B

(B) and (D)

C

(B) and (E)

D

Only (D)

E

Only (C)

Question 130: Palette 130/398

Errorless AIIMS 2006 MCQ

Assertion : $E^{o}$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$ .
Reason : The third ionisation energy of Mn is larger than that of Cr. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 131: Palette 131/398

Errorless DCE 2006; AFMC 2010 MCQ

Which of the following species has the highest electron affinity

A

$F^{-}$

B

O

C

$O^{-}$

D

$Na^{+}$

Question 132: Palette 132/398

Errorless RPMT 2006 MCQ

Which of the following is a false statement

A

Fluorine is more electronegative than chlorine

B

Nitrogen has greater $IE_{1}$ than oxygen

C

Lithium is amphoteric

D

Chlorine is an oxidising agent

Question 133: Palette 133/398

Errorless J & K CET 2006 MCQ

Pauling's equation for determining the electronegativity of an element is

A

$X_{A} - X_{B} = 0.208\sqrt{\Delta}$

B

$X_{A} + X_{B} = 0.208\sqrt{\Delta}$

C

$X_{A} - X_{B} = 0.208\Delta^{2}$

D

$X_{A} - X_{B} = \sqrt{\Delta}$

Question 134: Palette 134/398

Errorless RPMT 2006 MCQ

Which of the following element shows maximum valency

A

Carbon

B

Barium

C

Nitrogen

D

Sulphur

Question 135: Palette 135/398

Errorless RPMT 2006 MCQ

Fluorine is the best oxidising agent because it has

A

Highest electron affinity

B

Highest $E_{\mathrm{red}}^{\circ}$

C

Highest $E_{\mathrm{oxid}}^{\circ}$

D

Lowest electron affinity

Question 136: Palette 136/398

Errorless Odisha JEE 2005 MCQ

Ionisation energy in group I-A varies in the decreasing order as

A

$Li > Na > K > Cs$

B

$Na > Li > K > Cs$

C

$Li > Cs > K > Na$

D

$K > Cs > Na > Li$

Question 137: Palette 137/398

Errorless AIIMS 2005 MCQ

Assertion : First ionisation energy for nitrogen is lower than oxygen. Reason : Across a period effective nuclear charge decreases.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 138: Palette 138/398

Errorless RPMT 2005 MCQ

The electron affinity of $Be$ is similar to

A

He

B

B

C

Li

D

Na

Question 139: Palette 139/398

Errorless RPMT 2005 MCQ

The most polar bond is

A

$O - F$

B

$N - Cl$

C

$N - F$

D

$N - N$

Question 140: Palette 140/398

Errorless AIIMS 2005 MCQ

The pair of amphoteric hydroxides is

A

$Al(OH)_{3}$ , LiOH

B

$Be(OH)_{2}$ , $Mg(OH)_{2}$

C

$B(OH)_{3}$ , $Be(OH)_{2}$

D

$Be(OH)_{2}$ , $Zn(OH)_{2}$

Question 141: Palette 141/398

Errorless BHU 2005 MCQ

What will be the order of I $^{st}$ ionisation energy

A

Li > Na > K

B

K > Li > Na

C

Na > Li > K

D

Li > K > Na

Question 142: Palette 142/398

Errorless AIEEE 2005 MCQ

In which of the following arrangements the order is NOT according to the property indicated against it

A

$Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$ : Increasing ionic size

B

$B < C < N < O$ : Increasing first ionisation enthalpy

C

$I < Br < F < Cl$ : Increasing electron gain enthalpy (with negative sign)

D

$Li < Na < K < Rb$ : Increasing metallic radius

Question 143: Palette 143/398

Errorless AIEEE 2005 MCQ

Which of the following oxides is amphoteric in character

A

CaO

B

$\mathsf{CO}_{2}$

C

$\mathsf{SiO}_2$

D

$\mathsf{SnO}_2$

Question 144: Palette 144/398

Errorless KCET 2004; AFMC 2012 MCQ

The elements with atomic numbers 9, 17, 35, 53, 85 are all

A

Noble gases

B

Halogens

C

Heavy metals

D

Light metals

Question 145: Palette 145/398

Errorless DPMT 2004 MCQ

Which of the following alkali metal ions has lowest ionic mobility in aqueous solutions

A

$Rb^{+}$

B

$Cs^{+}$

C

$Li^{+}$

D

$Na^{+}$

Question 146: Palette 146/398

Errorless Pb.PMT 2004 MCQ

The trivalent ion having largest size in lanthanide series is

A

Ti

B

Zr

C

Hf

D

La

Question 147: Palette 147/398

Errorless Odisha JEE 2004 MCQ

Correct energy value order is

A

ns np nd(n-1)f

B

ns np(n-1)d (n-2)f

C

ns np(n-1)d (n-1)f

D

ns(n-1)d n(n-1)f

Question 148: Palette 148/398

Errorless Odisha JEE 2004 MCQ

The ionic conductance of following cation in a given concentration are in the order

A

$Li^{+} < Na^{+} > K^{+} < Rb^{+}$

B

$Li^{+} > Na^{+} > K^{+} > Rb^{+}$

C

$Li^{+} < Na^{+} > K^{+} > Rb^{+}$

D

$Li^{+} = Na^{+} < K^{+} < Rb^{+}$

Question 149: Palette 149/398

Errorless BHU 2004 MCQ

Which of the following has the highest first ionisation energy

A

Li

B

Be

C

B

D

C

Question 150: Palette 150/398

Errorless CPMT 2004 MCQ

Flourine is the best oxidising agent because it has

A

Highest electron affinity

B

Highest $E_{red}^{o}$

C

Highest $E_{oxid}^{o}$

D

Lowest electron affinity

Question 151: Palette 151/398

Errorless CPMT 2004; RPMT 2006 MCQ

Which among the following elements have lowest value of $IE_{1}$

A

$Pb$

B

$Sn$

C

$Si$

D

$C$

Question 152: Palette 152/398

Errorless Kerala PMT 2004; WB JEE 2008 MCQ

In a given shell, the order of screening effect is

A

s > p > d > f

B

f > d > p > s

C

p < d < s < f

D

d > f < s > p

E

f > p > s > d

Question 153: Palette 153/398

Errorless AIEEE 2004 MCQ

The formation of the oxide ion $O_{(g)}^{2-}$ requires first an exothermic and then an endothermic step as shown below $O_{(g)} + e^{-} = O_{(g)}^{-}\Delta H^{o} = -142\ kJmol^{-1}$ $O_{(g)}^{-} + e^{-} = O_{(g)}^{2-}\Delta H^{o} = 844\ kJmol^{-1}$ This is because

A

$O^{-}$ ion will tend to resist the addition of another electron

B

Oxygen has high electron affinity

C

Oxygen is more electronegative

D

$O^{-}$ ion has comparatively larger size than oxygen atom

Question 154: Palette 154/398

Errorless AIEEE 2004 MCQ

Which among the following factors is the most important in making fluorine the strongest oxidizing halogen

A

Hydration enthalpy

B

Ionisation enthalpy

C

Electron affinity

D

Bond dissociation energy

Question 155: Palette 155/398

Errorless AFMC 2004 MCQ

Which of these have no unit

A

Electronegativity

B

Electron affinity

C

Ionisation energy

D

Excitation potential

Question 156: Palette 156/398

Errorless AIEEE 2004 MCQ

Among $Al_{2}O_{3}, SiO_{2}, P_{2}O_{3}$ and $SO_{2}$ the correct order of acid strength is

A

$Al_{2}O_{3} < SiO_{2} < SO_{2} < P_{2}O_{3}$

B

$SiO_{2} < SO_{2} < Al_{2}O_{3} < P_{2}O_{3}$

C

$SO_{2} < P_{2}O_{3} < SiO_{2} < Al_{2}O_{3}$

D

$Al_{2}O_{3} < SiO_{2} < P_{2}O_{3} < SO_{2}$

Question 157: Palette 157/398

Errorless AIEEE 2004 MCQ

Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

A

Forming covalent halides

B

Forming polymeric hydrides

C

Exhibiting maximum covalency in compounds

D

Exhibiting amphoteric nature in their oxides

Question 158: Palette 158/398

Errorless BHU 2004 MCQ

Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)

A

Atomic size decrease

B

Ionisation energy increase

C

Metallic character decrease

D

Stability of $+2$ oxidation state increase

Question 159: Palette 159/398

Errorless KCET 2003; MP PMT 2003; Odisha JEE 2010 MCQ

Which of the following show diagonal relationship

A

B and Si

B

B and Al

C

B and Ga

D

B and C

Question 160: Palette 160/398

Errorless MP PMT 2003 MCQ

On going left to right in a period, in transition metals, their atomic volumes

A

Decrease

B

Increase

C

Remain same

D

None of these

Question 161: Palette 161/398

Errorless AIEEE 2003 MCQ

According to the periodic law of elements, the variation in properties of elements is related to their

A

Atomic masses

B

Nuclear masses

C

Atomic numbers

D

Nuclear neutron-proton number

Question 162: Palette 162/398

Errorless KCET 2003 MCQ

The element with atomic number 36 belongs to ..... block in the periodic table

A

$p$

B

$s$

C

$f$

D

$d$

Question 163: Palette 163/398

Errorless CBSE PMI 2003, 04 MCQ

Ionic radii are

A

Directly proportional to effective nuclear charge

B

Directly proportional to square of effective nuclear charge

C

Inversely proportional to effective nuclear charge

D

Inversely proportional to square of effective nuclear charge

Question 164: Palette 164/398

Errorless MP PMT 2003; BHU 2003 MCQ

Correct order of polarising power is

A

$Cs^{+} < K^{+} < Mg^{2+} < Al^{3+}$

B

$K^{+} < Cs^{+} < Mg^{2+} < Al^{3+}$

C

$Cs^{+} < K^{+} < Al^{3+} < Mg^{2+}$

D

$K^{+} < Cs^{+} < Al^{3+} < Mg^{2+}$

Question 165: Palette 165/398

Errorless Pb. CET 2003 MCQ

Which of the following properties show gradual decrease with increase in atomic number across a period in the periodic table

A

Electron affinity

B

Ionisation potential

C

Electronegativity

D

Size of atom

Question 166: Palette 166/398

Errorless EAMCET 2003 MCQ

The electron affinity values (in $kJ \, mol^{-1}$ ) of three halogens X,Y and Z are respectively -349, -333 and -325. Then X,Y and Z are respectively

A

$F_2, Cl_2$ and $Br_2$

B

$Cl_2, F_2$ and $Br_2$

C

$Cl_2, Br_2$ and $F_2$

D

$Br_2, Cl_2$ and $F_2$

Question 167: Palette 167/398

Errorless Kerala PMT 2003 MCQ

An atom with high electronegativity has

A

Large size

B

High ionisation potential

C

Low electron affinity

D

Low ionisation potential

Question 168: Palette 168/398

Errorless MP PMT 2003 MCQ

With respect to chlorine, hydrogen will be

A

Electropositive

B

Electronegative

C

Neutral

D

None of the above

Question 169: Palette 169/398

Errorless AIEEE 2003 MCQ

The solubilities of carbonates decreases down the magnesium group due to a decrease in

A

Lattice energies of solids

B

Hydration energies of cations

C

Inter-ionic attraction

D

Entropy of solution formation

Question 170: Palette 170/398

Errorless DCE 2003 MCQ

The polarising ability of which one of the following is highest

A

Small highly +ve ion

B

Large +ve ion

C

Small highly -ve ion

D

Large -ve ion

Question 171: Palette 171/398

Errorless Kerala PMT 2003 MCQ

In any period the valency of an element with respect to oxygen

A

Increases one by one from IA to VIIA

B

Decreases one by one from IA to VIIA

C

Increases one by one from IA to IVA and then decreases from VA to VIIA one by one

D

Decreases one by one from IA to IVA and then increases from VA to VIIA one by one

Question 172: Palette 172/398

Errorless UPSEAT 2003 MCQ

Which will show maximum non-metallic character

A

B

B

Be

C

Mg

D

Al

Question 173: Palette 173/398

Errorless RPET 2003 MCQ

Increasing order of electronegativity is

A

Bi < P < S < Cl

B

P < Bi < S < Cl

C

S < Bi < P < Cl

D

Cl < S < Bi < P

Question 174: Palette 174/398

Errorless CBSE PMT 2002 MCQ

If an atom has electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{3}4s^{2}$ , it will be placed in

A

Second group

B

Third group

C

Fifth group

D

Sixth group

Question 175: Palette 175/398

Errorless AMU 2002 MCQ

Which of the following has smallest bond angle

A

$H_{2}O$

B

$NH_{3}$

C

$CH_{4}$

D

$CO_{2}$

Question 176: Palette 176/398

Errorless AMU 2002 MCQ

The metal-having highest melting point is

A

Chromium

B

Tungsten

C

Diamond

D

Silver

Question 177: Palette 177/398

Errorless MP PMT 2002 MCQ

Which one of the elements is most metallic

A

$P$

B

As

C

$Sb$

D

$Bi$

Question 178: Palette 178/398

Errorless Odisha JEE 2002 MCQ

All the s-block elements of the periodic table are placed in the groups ...

A

IA and IIA

B

IIIA and IVA

C

B sub groups

D

VA to VIIA

Question 179: Palette 179/398

Errorless 2002 MCQ

Which of the following is the correct order of ionic radii (BHU 2002)

A

F > Li > Na > K

B

F > K > Na > Li

C

Na > K > F > Li

D

Li > Na > K > F

Question 180: Palette 180/398

Errorless KCET 2002 MCQ

Chloride ion and potassium ion are isoelectronic. Then

A

Potassium ion is relatively bigger

B

Depends on the other cation and anion

C

Their size are same

D

Chloride ion is bigger than potassium ion

Question 181: Palette 181/398

Errorless CBSE PMT 2002; AFMC 2012 MCQ

Which of the following order is wrong

A

$NH_{3} < PH_{3} < AsH_{3}$ -acidic nature

B

$Li^{+} < Na^{+} < K^{+} < Cs^{+}$ -ionic radius

C

$Al_{2}O_{3} < MgO < Na_{2}O < K_{2}O$ -basic

D

$Li < Be < B < C - 1^{\mathrm{st}}$ ionisation potential

Question 182: Palette 182/398

Errorless AIIMS 2002 MCQ

Spectrum of $Li^{2+}$ is similar to that of

A

H

B

He

C

Be

D

Ne

Question 183: Palette 183/398

Errorless JIPMER (Med.) 2002 MCQ

Arrange S, P, As in order of increasing ionisation energy

A

S < P < As

B

P < S < As

C

As < S < P

D

As < P < S

Question 184: Palette 184/398

Errorless MP PMT 2002 MCQ

Electron affinity depends on

A

Atomic size

B

Nuclear charge

C

Atomic number

D

Atomic size and nuclear charge both

Question 185: Palette 185/398

Errorless AFMC 2002 MCQ

The maximum valency of an element with atomic number 7 is

A

2

B

5

C

4

D

3

Question 186: Palette 186/398

Errorless KCET 2002 MCQ

Pentavalency in phosphorus is more stable when compared to that of nitrogen even though they belong to same group is due to

A

Reactivity of phosphorus

B

Inert nature of nitrogen

C

Dissimilar electronic configuration

D

Larger size of phosphorus atom

Question 187: Palette 187/398

Errorless AIIMS 2002 MCQ

Assertion : Dinegative anion of oxygen $(O^{2-})$ is quite common but dinegative anion of sulphur $(S^{2-})$ is less common.
Reason : Covalency of oxygen is two. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 188: Palette 188/398

Errorless AIEEE 2002 MCQ

Which is the correct order of ionic sizes (At. no.: Ce = 58, Sn = 50, Yb = 70 and Lu = 71)

A

Ce > Sn > Yb > Lu

B

Sn > Ce > Lu > Yb

C

Lu > Yb > Sn > Ce

D

Sn > Yb > Ce > Lu

Question 189: Palette 189/398

Errorless DPMT 2001 MCQ

The last member in each period of the periodic table is

A

An inert gas element

B

A transition element

C

A halogen

D

An alkali metal

Question 190: Palette 190/398

Errorless AIIMS 2001 MCQ

Which of the following ion is the smallest ion

A

$O_2^+$

B

$O_2^-$

C

$O_2$

D

$O_2^{-2}$

Question 191: Palette 191/398

Errorless AIIMS 2001 MCQ

Which of the following element has maximum, first ionisation potential

A

V

B

Ti

C

Cr

D

Mn

Question 192: Palette 192/398

Errorless MP PMT 2001 MCQ

Which one of the following is an incorrect statement

A

The ionisation potential of nitrogen is greater than that of oxygen

B

The electron affinity of fluorine is greater than that of chlorine

C

The ionisation potential of beryllium is greater than that of boron

D

The electronegativity of fluorine is greater than that of chlorine

Question 193: Palette 193/398

Errorless CBSE PMT 2001 MCQ

Which of the following gas does not have an octet or eight electrons in the outer shell

A

Ne

B

Ar

C

Rn

D

He

Question 194: Palette 194/398

Errorless IIT JEE 2001 MCQ

The set representing the correct order of first ionisation potential is

A

K > Na > Li

B

Be > Mg > Ca

C

B > C > N

D

Ge > Si > C

Question 195: Palette 195/398

Errorless AIIMS 2000 MCQ

Which of the following is the atomic number of a metal

A

32

B

34

C

36

D

38

Question 196: Palette 196/398

Errorless AIIMS 2000 MCQ

Which of the following statement is not correct regarding hydrogen atom

A

It resembles halogens in some properties

B

It resembles alkali metals in some properties

C

It can be placed in $7^{\text{th}}$ group of periodic table

D

It can not be placed in first group of periodic table

Question 197: Palette 197/398

Errorless CPMT 2000 MCQ

Which of the following dinegative anion is quite common

A

$S^{2-}$

B

$Se^{2-}$

C

$Te^{2-}$

D

$O^{2-}$

Question 198: Palette 198/398

Errorless CPMT 2000 MCQ

An element has electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}$ . Predict their period, group and block

A

Period $= 3^{\mathrm{rd}}$ , block $= p$ , group $= 16$

B

Period $= 5^{\mathrm{th}}$ , block $= s$ , group $= 1$

C

Period $= 3^{\mathrm{rd}}$ , block $= p$ , group $= 10$

D

Period $= 4^{\mathrm{th}}$ , block $= d$ , group $= 12$

Question 199: Palette 199/398

Errorless AFMC 2000 MCQ

Lithium shows similarities to magnesium in its chemical behaviour because

A

Similar size, same electronegativity and lower polarizing power

B

Similar size, greater electronegativity and similar polarizing power

C

Similar size, same electronegativity and similar high polarizing power

D

None of these

Question 200: Palette 200/398

Errorless DPMT 2000 MCQ

Which configuration represents a noble gas

A

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}$

B

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$

C

$1s^{2}2s^{2}2p^{6}3p^{6}$

D

$1s^{2}2s^{2}2p^{6}3s^{2}$

Question 201: Palette 201/398

Errorless MP PET 2000 MCQ

From which of the following the hydration energy of $Mg^{2+}$ is larger

A

$Na^{+}$

B

$Al^{3+}$

C

$Be^{2+}$

D

$Cr^{3+}$

Question 202: Palette 202/398

Errorless RPMT 2000 MCQ

The screening effect of $d$ -electrons is

A

Equal to that of $p$ -electrons

B

More than that of $p$ -electrons

C

Same as $f$ -electrons

D

Less than $p$ -electrons

Question 203: Palette 203/398

Errorless RPMT 2000 MCQ

Hydrogen can be put in halogen group because

A

It has deuterium and tritium as isotopes

B

It forms hydrides like chlorides

C

It contains one electron only

D

It is light

Question 204: Palette 204/398

Errorless RPET 2000 MCQ

Highest density is of ......

A

Ir

B

Os

C

Pb

D

Hg

Question 205: Palette 205/398

Errorless RPET 2000 MCQ

Under normal condition which of the following electronic configuration is able to form dipositive ion

A

$[Ar]4s^{1}$

B

$[Ne]2s^{2}3p^{6}$

C

$[Ne]3s^{2}$

D

None of these

Question 206: Palette 206/398

Errorless RPET 2000 MCQ

Astatine is a

A

Halogen

B

Rare earth element

C

Alkaline earth metal

D

None of these

Question 207: Palette 207/398

Errorless JIPMER 2000 MCQ

Which set has the same number of unpaired electrons in their ground state

A

$Cl^{-}, Fe^{3+}, Cr^{3+}$

B

$Na^{+}, Mg^{2+}, Al$

C

$Na, P, Cl$

D

$N, P, V$

Question 208: Palette 208/398

Errorless MP PET 2000 MCQ

Which one of the following should be most stable

A

$H_{2}^{+}$

B

$H^{+}$

C

$H$

D

$H^{-}$

Question 209: Palette 209/398

Errorless AIIMS 2000; MP PMT 2002 MCQ

Among the following options, the sequence of increasing first ionisation potential will be

A

B < C < N

B

B > C > N

C

C < B < N

D

N > C > B

Question 210: Palette 210/398

Errorless BHU 2000; MH CET 2003 MCQ

The correct order of reactivity of halogens is

A

$F > Cl > Br > I$

B

$F < Cl > Br < I$

C

$F < Cl < Br < I$

D

$F < Cl < Br > I$

Question 211: Palette 211/398

Errorless CPMT 2000 MCQ

The first ionisation potential will be maximum for

A

Lithium

B

Hydrogen

C

Uranium

D

Iron

Question 212: Palette 212/398

Errorless RPMT 2000 MCQ

Highest energy will be absorbed to eject out the electron in the configuration

A

$1s^{2}2s^{2}2p^{1}$

B

$1s^{2}2s^{2}2p^{3}$

C

$1s^{2}2s^{2}2p^{2}$

D

$1s^{2}2s^{2}2p^{4}$

Question 213: Palette 213/398

Errorless RPET 2000 MCQ

In which of the following process highest energy is absorbed

A

$Cu \rightarrow Cu^{+}$

B

$Br \rightarrow Br^{-}$

C

$I \rightarrow I^{-}$

D

$Li \rightarrow Li^{+}$

Question 214: Palette 214/398

Errorless AFMC 2000 MCQ

Which of the following has the least electron affinity in $kJmol^{-1}$

A

Oxygen

B

Carbon

C

Nitrogen

D

Boron

Question 215: Palette 215/398

Errorless MP PMT 2000 MCQ

Going from fluorine to chlorine, bromine and iodine, the electronegativity

A

Increases

B

Decreases

C

First decreases then increases

D

Changes randomly

Question 216: Palette 216/398

Errorless AMU 2000 MCQ

Which of the following sequence correctly represents the decreasing acid nature of oxides

A

$Li_{2}O > BeO > B_{2}O_{3} > CO_{2} > N_{2}O_{3}$

B

$N_{2}O_{3} > CO_{2} > B_{2}O_{3} > BeO > Li_{2}O$

C

$CO_{2} > N_{2}O_{3} > B_{2}O_{3} > BeO > Li_{2}O$

D

$B_{2}O_{3} > CO_{2} > N_{2}O_{3} > Li_{2}O > BeO$

Question 217: Palette 217/398

Errorless MP PMT 2000 MCQ

The halogen that is most easily reduced is

A

$F_{2}$

B

$Cl_{2}$

C

$Br_{2}$

D

$I_{2}$

Question 218: Palette 218/398

Errorless MP PET 2000 MCQ

The correct order of the increasing ionic character is

A

$BeCl_{2} < MgCl_{2} < CaCl_{2} < BaCl_{2}$

B

$BeCl_{2} < MgCl_{2} < BaCl_{2} > CaCl_{2}$

C

$BeCl_{2} < BaCl_{2} < MgCl_{2} < CaCl_{2}$

D

$BaCl_{2} < CaCl_{2} < MgCl_{2} < BeCl_{2}$

Question 219: Palette 219/398

Errorless CBSE PMT 2000 MCQ

The elements which occupy the peaks of ionisation energy curve, are

A

$Na, K, Rb, Cs$

B

$Na, Mg, Cl, I$

C

$Cl, Br, I, F$

D

$He, Ne, Ar, Kr$

Question 220: Palette 220/398

Errorless RPMT 2000 MCQ

Which of the following is not the correct increasing order of ionisation energy

A

$Cl^{-} < Ar < K^{+}$

B

$Au < Ag < Cu$

C

$Cs < Rb < K$

D

$K < Ca < Sc$

Question 221: Palette 221/398

Errorless DCE 2000 MCQ

In which block $106^{th}$ element belongs

A

s - block

B

p - block

C

d - block

D

f - block

Question 222: Palette 222/398

Errorless IIT 2000 MCQ

The correct order of radii is

A

N < Be < B

B

$F^{-} < O^{2-} < N^{3-}$

C

Na < Li < K

D

$Fe^{3+} < Fe^{2+} < Fe^{4+}$

Question 223: Palette 223/398

Errorless IIT 2000 MCQ

The correct order of acidic strength is

A

$Cl_{2}O_{7} > SO_{2} > P_{4}O_{10}$

B

$CO_{2} > N_{2}O_{5} > SO_{3}$

C

$Na_{2}O > MgO > Al_{2}O_{3}$

D

$K_{2}O > CaO > MgO$

Question 224: Palette 224/398

Errorless IIT 2000 MCQ

Amongst $H_{2}O$ , $H_{2}S$ , $H_{2}Se$ and $H_{2}Te$ , the one with the highest boiling point is

A

$H_{2}O$ because of hydrogen bonding

B

$H_{2}Te$ because of higher molecular weight

C

$H_{2}S$ because of hydrogen bonding

D

$H_{2}Se$ because of lower molecular weight

Question 225: Palette 225/398

Errorless IIT 2000 MCQ

Read the following statement and explanation and answer as per the options given below; Assertion : The first ionization energy of Be is greater than that of B Reason : 2p-orbital is lower in energy than 2s

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 226: Palette 226/398

Errorless DCE 1999 MCQ

Whose name is not associated with the development of Periodic Table

A

Prout's

B

Newlands

C

Rutherford

D

Loother Meyer

Question 227: Palette 227/398

Errorless AIIMS 1999; CPMT 1999 MCQ

The radii of $F, F^{-}, O$ and $O^{-2}$ are in the order of

A

$O^{2-} > F^{-} > O > F$

B

$O^{2-} > F^{-} > F > O$

C

$F^{-} > O^{2-} > F > O$

D

$O^{2-} > O > F^{-} > F$

Question 228: Palette 228/398

Errorless AFMC 1999; Pb. PMT 2002; BHU 2003 MCQ

Which of the following has the largest ionic radius

A

$Na^{+}$

B

$Ni^{+}$

C

$Cs^{+}$

D

$Mg^{+2}$

Question 229: Palette 229/398

Errorless AIIMS 1999 MCQ

Assertion : Positive ions will be wider than parent atoms. Reason : Nuclear charge pulls them closer.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 230: Palette 230/398

Errorless AIIMS 1999 MCQ

Assertion : The atomic radii of calcium is smaller than sodium. Reason : Calcium has a lower nuclear charge than sodium.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 231: Palette 231/398

Errorless CPMT 1999; CBSE PMT 2001 MCQ

Which of the order for ionisation energy is correct.

A

Be > B > C > N > O

B

B < Be < C < O < N

C

B < Be < C < N < O

D

B < Be < N < C < O

Question 232: Palette 232/398

Errorless AIIMS 1999 MCQ

Hydrogen has high ionisation energy than alkali metals, due to its

A

Large size

B

Small size

C

Ionic bond

D

Covalent bond

Question 233: Palette 233/398

Errorless CPMT 1999 MCQ

Which of the following relation is correct with respect to first (I) and second (II) ionisation potentials of sodium and magnesium

A

$I_{Mg} = II_{Na}$

B

$I_{Na} > I_{Mg}$

C

$II_{Mg} > II_{Na}$

D

$II_{Na} > II_{Mg}$

Question 234: Palette 234/398

Errorless AFMC 1999; Kerala PET 2002; Odisha JEE 2004, 05; MP PET 2008; MP PMT 2013 MCQ

Order of electron affinity of F, Cl, Br and I is ....

A

F < Cl > Br > I

B

F > Cl > Br > I

C

F < Cl < Br < I

D

F > Cl < Br > I

Question 235: Palette 235/398

Errorless AFMC 1999 MCQ

Which of the following set has the strongest tendency to form anions

A

Ga, In and Te

B

Na, Mg and Al

C

N, O and F

D

V, Cr and Mn

Question 236: Palette 236/398

Errorless MP PET 1999 MCQ

Which of the following metals exhibits more than one oxidation state

A

Na

B

Mg

C

Fe

D

Al

Question 237: Palette 237/398

Errorless RPET 1999 MCQ

Which of the following elements is found in native state

A

Al

B

Au

C

Cu

D

Na

Question 238: Palette 238/398

Errorless RPET 1999 MCQ

The basis of keeping the elements in the group of a periodic table is

A

Ionisation potential

B

Electronegativity

C

Electron affinity

D

Number of electrons in the valence shell

Question 239: Palette 239/398

Errorless DCE 1999, 2007 MCQ

An element 'X' which occurs in the first short period has an outer electronic structure $s^2 p^1$ . What is the formula and acid-base character of its oxides

A

$XO_3$ , basic

B

$X_2O_3$ , basic

C

$X_2O_3$ , acidic

D

$XO_2$ acidic

Question 240: Palette 240/398

Errorless KCET (Med.) 1999 MCQ

Fluorine, chlorine, bromine and iodine are placed in the same group (17) of the periodic table, because

A

They are non-metals

B

They are electronegative

C

Their atoms are generally univalent

D

They have 7 electrons in the outermost shell of their atom

Question 241: Palette 241/398

Errorless IIT JEE 1999 MCQ

Ionic radii of

A

$Ti^{4+} < Mn^{7+}$

B

$^{35}Cl^{-} < ^{37}Cl^{-}$

C

$K^{+} > Cl^{-}$

D

$P^{3+} > P^{5+}$

Question 242: Palette 242/398

Errorless AIIMS 1998 MCQ

Which of the following elements are analogous to the lanthanides

A

Actinides

B

Borides

C

Carbides

D

Hydrides

Question 243: Palette 243/398

Errorless Kurukshetra CEE 1998; AFMC 2000 MCQ

Which of the following pair has elements containing same number of electrons in the outermost orbit

A

N, O

B

Na, Ca

C

As, Bi

D

Pb, Sb

Question 244: Palette 244/398

Errorless MP PET/PMT 1998 MCQ

In the periodic table, the element with atomic number 16 will be placed in the group

A

Third

B

Fourth

C

Fifth

D

Sixth

Question 245: Palette 245/398

Errorless CET Pune 1998 MCQ

The electronic structure $(n-1)d^{1-10}ns^{0-2}$ is characteristic of

A

Transition elements

B

Lanthanides

C

Actinides

D

Rare gases

Question 246: Palette 246/398

Errorless CBSE PMT 1998 MCQ

The first ionisation potentials (eV) of Be and B respectively are

A

8.29eV, 9.32eV

B

9.32eV, 9.32eV

C

8.29eV, 8.29eV

D

9.32eV, 8.29eV

Question 247: Palette 247/398

Errorless CET Pune 1998; AFMC 2001; BVP 2003 MCQ

Ionisation energy is highest for

A

Noble gases

B

Platinum metals

C

Transition elements

D

Inner-transition elements

Question 248: Palette 248/398

Errorless Pune CET 1998 MCQ

Which ionisation potential (IP) in the following equations involves the greatest amount of energy

A

$Na \rightarrow Na^{+} + e^{-}$

B

$K^{+} \rightarrow K^{2+} + e^{-}$

C

$C^{2+} \rightarrow C^{3+} + e^{-}$

D

$Ca^{+} \rightarrow Ca^{2+} + e^{-}$

Question 249: Palette 249/398

Errorless Kurukshetra CEE 1998; MP PMT 2002; MP PET 2011 MCQ

The electron affinity for the inert gases is

A

Zero

B

High

C

Negative

D

Positive

Question 250: Palette 250/398

Errorless AIIMS 1998 MCQ

Which of the following is the most electropositive element

A

Aluminium

B

Magnesium

C

Phosphorus

D

Sulphur

Question 251: Palette 251/398

Errorless MP PET/PMT 1998 MCQ

In the following, the element with the highest electropositivity is

A

Copper

B

Cesium

C

Barium

D

Chromium

Question 252: Palette 252/398

Errorless MP PET/PMT 1998; MP PMT 2002 MCQ

On going from right to left in a period in the periodic table the electronegativity of the elements

A

Increases

B

Decreases

C

Remain unchanged

D

Decreases first then increases

Question 253: Palette 253/398

Errorless MP PET/PMT 1998 MCQ

Which element has the highest electronegativity

A

C

B

Mg

C

O

D

S

Question 254: Palette 254/398

Errorless CBSE PMT 1998 MCQ

Which of the following elements shows maximum number of different oxidation states in its compounds

A

Eu

B

La

C

Gd

D

Am

Question 255: Palette 255/398

Errorless Pb. PMT 1998 MCQ

Which of the following configurations represents atoms of the elements having the highest second ionisation energy

A

$1s^{2}2s^{2}2p^{4}$

B

$1s^{2}2s^{2}2p^{6}$

C

$1s^{2}2s^{2}2p^{6}3s^{1}$

D

$1s^{2}2s^{2}2p^{6}3s^{2}$

Question 256: Palette 256/398

Errorless CPMT 1997 MCQ

The long form of periodic table is based on

A

Shape of the atom

B

Mass of the atom

C

Atomic number of the atom

D

Electronegativity

Question 257: Palette 257/398

Errorless RPMT 1997; EAMCET 1998 MCQ

As per the modern periodic law, the physical and chemical properties of elements are periodic functions of their

A

Atomic volume

B

Electronic configuration

C

Atomic weight

D

Atomic size

Question 258: Palette 258/398

Errorless MP PMT 1997; RPMT 2002 MCQ

Which of the properties remains unchanged on descending a group in the periodic table

A

Atomic size

B

Density

C

Valence electrons

D

Metallic character

Question 259: Palette 259/398

Errorless MP PET 1997 MCQ

Who developed the long form of periodic table

A

Lothar Meyer

B

Niels Bohr

C

Mendeleev

D

Moseley

Question 260: Palette 260/398

Errorless RPMT 1997 MCQ

Dobernier traids is

A

Na, K, Rb

B

Mg, S, As

C

Cl, Br, I

D

P, S, As

Question 261: Palette 261/398

Errorless CBSE PMT 1997 MCQ

Which of the following does not represent the correct order of the property indicated

A

$Sc^{3+} > Cr^{3+} > Fe^{3+} > Mn^{3+}$ : ionic radii

B

$Sc < Ti < Cr < Mn : \text{Density}$

C

$Mn^{2+} > Ni^{2+} < Co^{2+} < Fe^{2+}$ : ionic radii

D

$FeO < CaO > MnO > CuO$ : Basic nature

Question 262: Palette 262/398

Errorless EAMCET 1997; BHU 1999 MCQ

Of the following, the one with largest size is

A

$Cl^{-}$

B

Ar

C

$K^{+}$

D

$Ca^{2+}$

Question 263: Palette 263/398

Errorless MP PMT 1997 MCQ

Point out the wrong statement In a given period of the periodic table the s - block element has, in general, a lower value of

A

Ionisation energy

B

Electronegativity

C

Atomic radius

D

Electron affinity

Question 264: Palette 264/398

Errorless MP PET 1997 MCQ

The atomic radius of elements of which of the following series would be nearly the same

A

Na K Rb Cs

B

Li Be B C

C

Fe Co Ni Cu

D

F Cl Br I

Question 265: Palette 265/398

Errorless JIPMER 1997; CPMT 1997; AIIMS 2000 MCQ

Which of the following gaseous atoms has highest value of IE

A

P

B

Si

C

Mg

D

Al

Question 266: Palette 266/398

Errorless RPMT 1997; DCE 1999; BHU 2006 MCQ

The ionisation energy of nitrogen is larger than that of oxygen because of

A

Greater attraction of electrons by the nucleus

B

The size of nitrogen atom being smaller

C

The half-filled $p$ -orbitals possess extra stability

D

Greater penetration effect

Question 267: Palette 267/398

Errorless CPMT 1997 MCQ

First I.P. of Mg is ..... than Al

A

Less

B

More

C

Equal

D

None of these

Question 268: Palette 268/398

Errorless JIPMER 1997 MCQ

The second ionisation potential of an element M is the energy required to

A

Remove one mole of electron from one mole of gaseous anion

B

Remove one mole of electron from one mole of gaseous cation of the element

C

Remove one mole of electron from one mole of monovalent gaseous cation of the element

D

Remove 2 moles of electrons from one mole of gaseous atoms

Question 269: Palette 269/398

Errorless CPMT 1997 MCQ

Fluorine has low electron affinity than chlorine because of

A

Smaller radius of fluorine, high density

B

Smaller radius of chlorine, high density

C

Bigger radius of fluorine, less density

D

Smaller radius of chlorine, less density

Question 270: Palette 270/398

Errorless MP PET 1997; J & K CET 2005 MCQ

The correct order of electron affinity of B, C, N, O is

A

O > C > N > B

B

B > N > C > O

C

O > C > B > N

D

O > B > C > N

Question 271: Palette 271/398

Errorless JIPMER 1997 MCQ

All element in $3^{rd}$ period have

A

An atomic number 3

B

3 complete sub-shells

C

Valence electrons shell

D

3 electrons less than the octet

Question 272: Palette 272/398

Errorless RPMT 1997 MCQ

Which has highest melting point

A

LiCl

B

BeCl₂

C

BCl₃

D

CCl₄

Question 273: Palette 273/398

Errorless IIT 1997 MCQ

The incorrect statement among the following is

A

The first ionization potential of Al is less than the first ionization potential of Mg

B

The second ionization potential of Mg is greater than the second ionization potential of Na

C

The first ionization potential of Na is less than the first ionization potential of Mg

D

The third ionization of Mg is greater than third ionization of Al

Question 274: Palette 274/398

Errorless IIT 1997 MCQ

Which of the following compounds is expected to be coloured

A

$Ag_{2}SO_{4}$

B

$CuF_{2}$

C

$MgF_{2}$

D

$CuCl$

Question 275: Palette 275/398

Errorless BHU 1996; AMU 2000 MCQ

Which of the following is metalloid

A

Pb

B

Zn

C

As

D

None of these

Question 276: Palette 276/398

Errorless DPMT 1996 MCQ

Last element of group-IV is found to be

A

Strong metallic

B

Weak metallic

C

Strong non-metallic

D

Weak non-metallic

Question 277: Palette 277/398

Errorless MP PMT 1996 MCQ

Element of atomic number 23 is placed in the periodic table in

A

s-block

B

p-block

C

d-block

D

f-block

Question 278: Palette 278/398

Errorless MP PET 1996; MP PMT 1996 MCQ

All the elements in a group in the periodic table have the same

A

Atomic number

B

Electronic configuration

C

Atomic weight

D

Number of electrons in the outermost shell or number of electrons for bonding

Question 279: Palette 279/398

Errorless MP PET 1996 MCQ

Elements in which 4f orbitals are progressively filled are called as

A

Transition elements

B

Lanthanides

C

Actinides

D

Inert gases

Question 280: Palette 280/398

Errorless Bihar MEE 1996 MCQ

Coloured salts are formed by

A

Alkali metals

B

Lanthanides

C

Actinides

D

Transition metals

E

None of these

Question 281: Palette 281/398

Errorless CBSE PMT 1996 MCQ

Which of the following is largest

A

$Cl^{-}$

B

$S^{2-}$

C

$Na^{+}$

D

$F^{-}$

Question 282: Palette 282/398

Errorless CBSE PMT 1996; MP PMT 2013 MCQ

Which of the following has the smallest size

A

$Na^{+}$

B

$Mg^{+2}$

C

$Cl^{-}$

D

$F^{-}$

Question 283: Palette 283/398

Errorless MP PMT 1996 MCQ

The order of magnitude of ionic radii of ions $Na^{+}, Mg^{2+}, Al^{3+}$ and $Si^{4+}$ is

A

$Na^{+} < Mg^{2+} < Al^{3+} < Si^{4+}$

B

$Mg^{2+} > Na^{+} > Al^{3+} > Si^{4+}$

C

$Al^{3+} > Na^{+} > Si^{4+} > Mg^{2+}$

D

$Na^{+} > Mg^{2+} > Al^{3+} > Si^{4+}$

Question 284: Palette 284/398

Errorless MP PET 1996 MCQ

Of the following the ion with the smallest ionic radius is

A

$K^{+}$

B

$Ca^{2+}$

C

$Ti^{3+}$

D

$Ti^{4+}$

Question 285: Palette 285/398

Errorless CPMT 1996; DCE 2001 MCQ

The ionisation potential of hydrogen from ground state to the first excited state is

A

$-13.6\mathrm{eV}$

B

$13.6\mathrm{eV}$

C

$-3.4\mathrm{eV}$

D

$3.4\mathrm{eV}$

Question 286: Palette 286/398

Errorless MP PET 1996; UPSEAT 2001 MCQ

The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

A

There is increase in the nuclear charge of the alkaline earth metals

B

There is a decrease in the nuclear charge of the alkaline earth metals

C

There is no change in the nuclear charge

D

None of the above

Question 287: Palette 287/398

Errorless KCET 1996 MCQ

Which of the following species has lowest ionisation potential

A

O

B

$O_{2}$

C

$O_{2}^{+}$

D

$O_{2}^{-}$

Question 288: Palette 288/398

Errorless BHU 1996 MCQ

The amount of energy which is released due to addition of extra electron to the outermost orbit of gaseous atom is called

A

Electron capacity

B

Electron affinity

C

Ionisation potential

D

Electronegativity

Question 289: Palette 289/398

Errorless IIT 1996 MCQ

Which of the following has the maximum number of unpaired electrons

A

$Mg^{2+}$

B

$Ti^{3+}$

C

$V^{3+}$

D

$Fe^{2+}$

Question 290: Palette 290/398

Errorless IIT JEE 1996 MCQ

Which one of the following oxides is neutral

A

CO

B

$\mathsf{SnO}_2$

C

ZnO

D

$\mathsf{SiO}_2$

Question 291: Palette 291/398

Errorless CBSE PMT 1995 MCQ

The electronic configuration of an element is $1s^{2}, 2s^{2} 2p^{6}, 3s^{2} 3p^{3}$ . What is the atomic number of the element which is just below the above element in the periodic table

A

33

B

34

C

31

D

49

Question 292: Palette 292/398

Errorless AFMC 1995 MCQ

The most common lanthanide is

A

Lanthanum

B

Cerium

C

Samarium

D

Plutonium

Question 293: Palette 293/398

Errorless MP PMT 1995 MCQ

The element with atomic number 55 belongs to

A

s-block

B

p-block

C

d-block

D

f-block

Question 294: Palette 294/398

Errorless MP PMT 1995 MCQ

The electronic configuration of an atom A is $1s^{2}$ , $2s^{2}2p^{6}$ , $3s^{2}3p^{6}3d^{10}$ , $4s^{2}4p^{3}$ . The chemistry of A is therefore likely to be similar to that of

A

Chlorine

B

Nitrogen

C

Oxygen

D

Boron

Question 295: Palette 295/398

Errorless MP PMT 1995 MCQ

Alkali metals in each period have

A

Smallest size

B

Lowest ionisation potential

C

Highest ionisation potential

D

Highest electronegativity

Question 296: Palette 296/398

Errorless AIIMS 1995 MCQ

Assertion : Noble gases have maximum electron affinity. Reason : High electron affinity shows that the electron is loosely bonded to the atom. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not the correct explanation of the assertion. (d) If the assertion and reason both are false. (e) If assertion is false but reason is true.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 297: Palette 297/398

Errorless AFMC 1995, 97; CPMT 1999 MCQ

Arrange the following in increasing order of their atomic radius: Na, K, Mg, Rb

A

Mg < K < Na < Rb

B

Mg < Na < K < Rb

C

Mg < Na < Rb < K

D

Na < K < Rb < Mg

Question 298: Palette 298/398

Errorless MP PMT 1995, 2003; JIPMER (Med.) 2002 MCQ

Which of the following has largest size

A

Al

B

$Al^{+}$

C

$Al^{+2}$

D

$Al^{+3}$

Question 299: Palette 299/398

Errorless MP PET 1995 MCQ

The atomic radii in periodic table among elements from right to left

A

Decreases

B

Increases

C

Remain constant

D

First decreases and then increases

Question 300: Palette 300/398

Errorless Roorkee (IIT) 1995 MCQ

If first orbit energy of $He^{+}$ is -54.4 eV, then the second orbit energy will be

A

-54.4 eV

B

-13.6 eV

C

-27.2 eV

D

+27.2 eV

Question 301: Palette 301/398

Errorless IIT 1995 MCQ

Which has most stable +2 oxidation state

A

Sn

B

Pb

C

Fe

D

Ag

Question 302: Palette 302/398

Errorless Roorkee (IIT) 1995 MCQ

The decreasing order of size of isoelectronic series $K^{+}, Ca^{2+}, Cl^{-}$ and $S^{2-}$ is

A

$K^{+} > Ca^{2+} > S^{2-} > Cl^{-}$

B

$K^{+} > Ca^{2+} > Cl^{-} > S^{2-}$

C

$Ca^{2+} > K^{+} > Cl^{-} > S^{2-}$

D

$S^{2-} > Cl^{-} > K^{+} > Ca^{2+}$

Question 303: Palette 303/398

Errorless Roorkee (IIT) 1995 MCQ

Which one of the elements has the maximum electron affinity

A

$F$

B

$Cl$

C

$Br$

D

$I$

Question 304: Palette 304/398

Errorless Roorkee (IIT) 1995 MCQ

Which element has the highest electronegativity Or Which of the following is the most electronegative

A

$F$

B

He

C

Ne

D

Na

Question 305: Palette 305/398

Errorless CBSE PMT 1994 MCQ

Which of the following statement concerning lanthanides elements is false

A

Lanthanides are separated from one another by ion exchange method

B

Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number

C

All lanthanides are highly dense metals

D

More characteristic oxidation state of lanthanide

Question 306: Palette 306/398

Errorless MP PMT 1994 MCQ

An atom of an element has electronic configuration 2, 8, 1. Which of the following statement is correct

A

The element's valency is 7

B

The element exists as a diatomic molecule

C

The element is of non-metallic nature

D

The element forms a basic oxide

Question 307: Palette 307/398

Errorless MP PET 1994 MCQ

In which of the following pairs the difference between the covalent radii of the two metals is maximum

A

$K, Ca$

B

Mn, Fe

C

Co, Ni

D

Cr, Mn

Question 308: Palette 308/398

Errorless MP PMT 1994 MCQ

The screening effect of inner electrons of the nucleus causes

A

A decrease in the ionisation potential

B

An increase in the ionisation potential

C

No effect on the ionisation potential

D

An increase in the attraction of the nucleus to the electrons

Question 309: Palette 309/398

Errorless CPMT 1994 MCQ

The electron affinity of

A

Carbon is greater than oxygen

B

Sulphur is less than oxygen

C

Iodine is greater than bromine

D

Bromine is less than chlorine

Question 310: Palette 310/398

Errorless MP PET 1994 MCQ

On Pauling scale which of the following does not have electronegativity $\geq 3.0$

A

Oxygen

B

Nitrogen

C

Chlorine

D

Bromine

Question 311: Palette 311/398

Errorless CPMT 1993 MCQ

The total number of rare-earth elements is

A

8

B

32

C

14

D

10

Question 312: Palette 312/398

Errorless EAMCET 1993; MP PET 2001, 11; AIEEE 2004 MCQ

Which one of the following ions has the highest value of ionic radius

A

$O^{2-}$

B

$B^{3+}$

C

$Li^{+}$

D

$F^{-}$

Question 313: Palette 313/398

Errorless MP PET 1993 MCQ

Which one of the following is the biggest ion

A

$Al^{+3}$

B

$Ba^{+2}$

C

$Mg^{+2}$

D

$Na^{+}$

Question 314: Palette 314/398

Errorless MP PET 1993 MCQ

Which of the following sets of elements have the strongest tendency to form anions

A

$N, O, F$

B

$P, S, Cl$

C

As, Se, Br

D

$Sb, Te, I$

Question 315: Palette 315/398

Errorless MP PMT 1993; MP PET 1995, 2001; CBSE PMT 2009 MCQ

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states

A

$3d^{3}4s^{2}$

B

$3d^{5}4s^{1}$

C

$3d^{5}4s^{2}$

D

$3d^{2}4s^{2}$

Question 316: Palette 316/398

Errorless MP PET 1993 MCQ

In the periodic table, the metallic character of elements

A

Decreases from left to right across a period and on descending a group

B

Decreases from left to right across a period and increases on descending a group

C

Increases from left to right across a period and on descending a group

D

Increases from left to right across a period and decreases on descending a group

Question 317: Palette 317/398

Errorless KCET 1993 MCQ

Which is the weakest base

A

NaOH

B

KOH

C

$\mathrm{Ca(OH)_2}$

D

$\mathrm{Zn(OH)_2}$

Question 318: Palette 318/398

Errorless AIIMS 1992; UPSEAT 2001 MCQ

Chloride of an element A gives neutral solution in water. In the periodic table, the element A belongs to

A

First group

B

Third group

C

Fifth group

D

First transition series

Question 319: Palette 319/398

Errorless AFMC 1992; Manipal MEE 1995 MCQ

Which of the following elements is a lanthanide (Rare-earth element)

A

Cadmium

B

Californium

C

Cerium

D

Cesium

Question 320: Palette 320/398

Errorless MNR 1992; UPSEAT 1999, 2000, 02 MCQ

The electronic configuration of the element which is just above the element with atomic number 43 in the same periodic group is

A

$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{5} 4s^{2}$

B

$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{5}$

C

$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{6} 4s^{1}$

D

$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{1} 4p^{6}$

Question 321: Palette 321/398

Errorless CBSE PMT 1992 MCQ

Elements of which group form anions most readily

A

Oxygen family

B

Nitrogen group

C

Halogens

D

Alkali metals

Question 322: Palette 322/398

Errorless EAMCET 1992 MCQ

$Al^{3+}$ has a lower ionic radius than $Mg^{2+}$ because

A

Mg atom has less number of neutrons than Al

B

$Al^{3+}$ has a higher nuclear charge than $Mg^{2+}$

C

Their electronegativities are different

D

Al has a lower ionisation potential than Mg atom

Question 323: Palette 323/398

Errorless AIIMS 1992 MCQ

Which of the following transitions involves maximum amount of energy

A

$M^{-}(g)\rightarrow M(g)$

B

$M(g)\rightarrow M^{+}(g)$

C

$M^{+}(g)\rightarrow M^{2 + }(g)$

D

$M^{2 + }(g)\rightarrow M^{3 + }(g)$

Question 324: Palette 324/398

Errorless KCET 1992 MCQ

Which of the following elements will have the lowest first ionisation energy

A

Mg

B

Rb

C

Li

D

Ca

Question 325: Palette 325/398

Errorless CBSE PMT 1992 MCQ

If the valency shell electronic structure for an element is $ns^{2}np^{5}$ , this element will belong to the group of

A

Alkali metals

B

Inert metals

C

Noble gases

D

Halogens

Question 326: Palette 326/398

Errorless Bihar CEE 1992 MCQ

Which of the following electronic configurations in the outermost shell is characteristic of alkali metals

A

$(n - 1)s^{2}p^{6},ns^{2}p^{1}$

B

$(n - 1)s^{2}p^{6}d^{10},ns^{1}$

C

$(n - 1)s^{2}p^{6},ns^{1}$

D

$ns^2 p^6 d^1$

Question 327: Palette 327/398

Errorless CBSE PMT 1992; AFMC 1998; CPMT 1999; DCE 2006 MCQ

A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration

A

$1s^{2}, 2s^{2}2p^{6}, 3s^{1}$

B

$1s^{2}, 2s^{2}2p^{6}, 3s^{2}3p^{1}$

C

$1s^{2}, 2s^{2}2p^{6}, 3s^{2}3p^{2}$

D

$1s^{2}, 2s^{2}2p^{6}, 3s^{2}$

Question 328: Palette 328/398

Errorless CPMT 1991; Kurukshetra CEE 1991; MP PET 2001 MCQ

An element of atomic number 29 belongs to

A

s-block

B

p-block

C

d-block

D

f-block

Question 329: Palette 329/398

Errorless Kurukshetra CEE 1991 MCQ

Which one of the following belongs to representative group of elements in the periodic table

A

Lanthanum

B

Argon

C

Chromium

D

Aluminium

Question 330: Palette 330/398

Errorless Kurukshetra CEE 1991; KCET 2008 MCQ

An element with atomic number 21 is a

A

Transition element

B

Alkali metal

C

Halogen

D

Representative element

Question 331: Palette 331/398

Errorless AIIMS 1991 MCQ

Which has the highest second ionisation potential

A

Nitrogen

B

Carbon

C

Oxygen

D

Fluorine

Question 332: Palette 332/398

Errorless Kurukshetra CEE 1991 MCQ

With reference to concept of ionisation potential, which one of the following sets are correct

A

$U > K > Cs$

B

$B > U > K$

C

$Cs > U > B$

D

$Cs < U < K$

Question 333: Palette 333/398

Errorless KCET 1991; CBSE PMT 1991; Pb. PET 1999; BHU 2000 MCQ

Which element having following electronic configurations has minimum ionisation potential

A

$1s^{1}$

B

$1s^{2}, 2s^{2} 2p^{6}$

C

$1s^{2}, 2s^{2} 2p^{6}, 3s^{1}$

D

$1s^{2}, 2s^{2} 2p^{2}$

Question 334: Palette 334/398

Errorless AFMC 1990 MCQ

The telluric helix was given by

A

De Chan Courtois

B

Newlands

C

L. Meyer

D

Mendeleev

Question 335: Palette 335/398

Errorless BIT 1990; UPSEAT 2001; MP PMT 2001; AFMC 2012 MCQ

Which of these does not reflect the periodicity of the elements

A

Bonding behaviour

B

Electronegativity

C

Ionisation energy

D

Neutron/proton ratio

Question 336: Palette 336/398

Errorless EAMCET 1990; MP PET 1995, 96; Pb. CET 2001; RPMT 2002 MCQ

Chemical property of Li and Mg are similar because

A

These belong to same group

B

Both ionisation potential is same

C

Shows diagonal relationship

D

Both electron affinity is same

Question 337: Palette 337/398

Errorless DPMT 1990; DCE 2000 MCQ

The correct order of increasing order of oxidising power is

A

$F_{2} < Cl_{2} < Br_{2} < I_{2}$

B

$F_{2} < Br_{2} < Cl_{2} < I_{2}$

C

$Cl_{2} < Br_{2} < F_{2} < I_{2}$

D

$I_{2} < Br_{2} < Cl_{2} < F_{2}$

Question 338: Palette 338/398

Errorless Roorkee (IIT) 1990 MCQ

Arrange $S, O$ and $Se$ in ascending order of electron affinity

A

$O < Se < S$

B

$Se < O < S$

C

$S < O < Se$

D

$S < Se < O$

Question 339: Palette 339/398

Errorless IIT 1990 MCQ

Amongst the following elements (whose electronic configurations are given below), the one having the highest ionization energy is

A

$[Ne]3s^{2}3p^{1}$

B

$[Ne]3s^{2}3p^{3}$

C

$[Ne]3s^{2}3p^{2}$

D

$[Ne]3d^{10}4s^{2}4p^{3}$

Question 340: Palette 340/398

Errorless Roorkee (IIT) 1990 MCQ

The process requiring the absorption of energy is

A

$F \rightarrow F^{-}$

B

$Cl \rightarrow Cl^{-}$

C

$O \rightarrow O^{2-}$

D

$H \rightarrow H^{-}$

Question 341: Palette 341/398

Errorless IIT JEE 1990; JEE (Main) 2021 MCQ

Consider the elements $Mg$ , $Al$ , $S$ , $P$ and $Si$ , the correct increasing order of their first ionization enthalpy is

A

$Mg < Al < Si < S < P$

B

$Al < Mg < Si < S < P$

C

$Mg < Al < Si < P < S$

D

$Al < Mg < S < Si < P$

Question 342: Palette 342/398

Errorless CBSE PMT 1989 MCQ

Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was

A

Mullikan's oil drop experiment

B

Moseley's work on $X$ -ray spectra

C

Bragg's work on $X$ -ray diffraction

D

Discovery of $X$ -rays by Rontgen

Question 343: Palette 343/398

Errorless CPMT 1989 MCQ

In a period, elements are arranged in strict sequence of

A

Decreasing charges in the nucleus

B

Increasing charges in the nucleus

C

Constant charges in the nucleus

D

Equal charges in the nucleus

Question 344: Palette 344/398

Errorless Pb. CET 1989 MCQ

In the isoelectronic species the ionic radii (Å) of $N^{3-}$ , $O^{2-}$ and $F^{-}$ are respectively given by

A

1.36, 1.40, 1.71

B

1.36, 1.71, 1.40

C

1.71, 1.40, 1.36

D

1.71, 1.36, 1.40

Question 345: Palette 345/398

Errorless EAMCET 1989 MCQ

Which one of the following indicates the correct order of atomic size

A

$Be > F > C > Ne$

B

$Be < C < F < Ne$

C

$Be > C > F > Ne$

D

$F < Ne < Be < C$

Question 346: Palette 346/398

Errorless CPMT 1989; MP PET 2001 MCQ

Ionisation potential is lowest for

A

Halogens

B

Inert gases

C

Alkaline earth metals

D

Alkali metals

Question 347: Palette 347/398

Errorless CPMT 1989 MCQ

Electronegativity is a measure of the capacity of an atom to

A

Attract electrons

B

Attract protons

C

Repel electrons

D

Repel protons

Question 348: Palette 348/398

Errorless IIT 1989 MCQ

Which of the following is paramagnetic

A

$O_2^-$

B

$CN^{-}$

C

$CO$

D

$NO^{+}$

Question 349: Palette 349/398

Errorless IIT 1989 MCQ

Which one of the following is strongest base

A

$AsH_{3}$

B

$NH_{3}$

C

$PH_{3}$

D

$SbH_{3}$

Question 350: Palette 350/398

Errorless IIT 1989 MCQ

Which one of the following is the smallest in size

A

$N^{3-}$

B

$O^{2-}$

C

$F^{-}$

D

$Na^{+}$

Question 351: Palette 351/398

Errorless CPMT 1988 MCQ

The tenth elements in the periodic table resembles with the

A

First period

B

Second period

C

Fourth group

D

Ninth group

Question 352: Palette 352/398

Errorless CPMT 1988; MP PET 1993; Pb. CET 2003; MP PMT 2006 MCQ

Aluminium is diagonally related to (in periodic table)

A

Li

B

C

C

B

D

Be

Question 353: Palette 353/398

Errorless AFMC 1988 MCQ

The lightest metal is

A

Li

B

Mg

C

Ca

D

Na

Question 354: Palette 354/398

Errorless IIT 1988 MCQ

The first ionization potential of Na, Mg, Al and Si are in the order

A

Na < Mg > Al < Si

B

Na > Mg > Al > Si

C

Na < Mg < Al < Si

D

Na > Mg > Al < Si

Question 355: Palette 355/398

Errorless EAMCET 1987, 90; RPMT 1997; MP PET 2003; Bihar CEE 2006 MCQ

Which pair of elements has same chemical properties

A

13, 22

B

3, 11

C

4, 24

D

2, 4

Question 356: Palette 356/398

Errorless IIT 1987 MCQ

The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by

A

14.6, 13.6

B

13.6, 14.6

C

13.6, 13.6

D

14.6, 14.6

Question 357: Palette 357/398

Errorless IIT 1987 MCQ

Atomic radii of fluorine and neon in Angstrom unit are respectively given by

A

0.72, 1.60

B

1.60, 1.60

C

0.72, 0.72

D

None of these values

Question 358: Palette 358/398

Errorless IIT 1987 MCQ

The electronegativity of the following elements increases in the order

A

$C,N,Si,P$

B

$N,Si,C,P$

C

$Si,P,C,N$

D

$P,Si,N,C$

Question 359: Palette 359/398

Errorless CPMT 1986; KCET 1998 MCQ

The long form of periodic table has

A

Eight horizontal rows and seven vertical columns

B

Seven horizontal rows and eighteen vertical columns

C

Seven horizontal rows and seven vertical columns

D

Eight horizontal rows and eight vertical columns

Question 360: Palette 360/398

Errorless Pb. CET 1986; CBSE PMT 1997; Kurukshetra CEE 1998; RPMT 1999; DCE 1999, 2007; MP PET 2000; MP PMT 2001; BCECE 2005 MCQ

Which one is the correct order of the size of the iodine species

A

$I > I^{+} > I^{-}$

B

$I > I^{-} > I^{+}$

C

$I^{+} > I^{-} > I$

D

$I^{-} > I > I^{+}$

Question 361: Palette 361/398

Errorless MP PMT 1986 MCQ

In third row of periodic table the atomic radii from Na to Cl

A

Continuously decreases

B

Continuously increases

C

Remains constant

D

Increases but not continuously

Question 362: Palette 362/398

Errorless MP PET 1986 MCQ

In third row of periodic table from Na to Cl

A

Electronegativity increases

B

Electronegativity decreases

C

Ionisation energy decreases

D

Atomic volume increases

Question 363: Palette 363/398

Errorless CPMT 1985; UPSEAT 2001; BHU 2003 MCQ

Which of the following pairs has both members from the same period of the periodic table

A

$Na - Ca$

B

$Na - Cl$

C

$Ca - Cl$

D

$Cl - Br$

Question 364: Palette 364/398

Errorless CPMT 1985; AIEEE 2011 MCQ

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides

A

$Al_{2}O_{3} < MgO < Na_{2}O < K_{2}O$

B

$MgO < K_{2}O < Al_{2}O_{3} < Na_{2}O$

C

$Na_{2}O < K_{2}O < MgO < Al_{2}O_{3}$

D

$K_{2}O < Na_{2}O < Al_{2}O_{3} < MgO$

Question 365: Palette 365/398

Errorless DPMT 1984; UPSEAT 2001 MCQ

Diagonal relationship is shown by

A

Elements of first period

B

Elements of second period

C

Elements of third period

D

Both b and c

Question 366: Palette 366/398

Errorless CPMT 1983 MCQ

Out of the following elements which one do you expect to be most reactive chemically

A

Mg

B

Ca

C

Sr

D

Ba

Question 367: Palette 367/398

Errorless AIIMS 1982 MCQ

Elements after atomic number 103 have not been discovered till now. If an element with atomic number 106 were ever discovered which of the following electronic configuration will it possess

A

$[Rn]5f^{14}6d^{4}7s^{2}$

B

$[Rn]5f^{14}6d^{5}7s^{1}$

C

$[Rn]5f^{14}6d^{6}7s^{0}$

D

$[Rn]5f^{14}6d^{1}7s^{2}7p^{3}$

Question 368: Palette 368/398

Errorless CPMT 1982 MCQ

The elements having the electronic configuration, $[Kr]$ $4d^{10}, 4f^{14}, 5s^2, 5p^6, 5d^2, 6s^2$ belongs to

A

s-block

B

$p$ -block

C

$d$ -block

D

$f$ -block

Question 369: Palette 369/398

Errorless AIIMS 1982; DPMT 1982 MCQ

Which has the maximum atomic radius

A

Al

B

Si

C

P

D

Mg

Question 370: Palette 370/398

Errorless CPMT 1982 MCQ

In a period from Li to F, ionisation potential

A

Increases

B

Decreases

C

Remains same

D

None of the above

Question 371: Palette 371/398

Errorless CPMT 1982, 93 MCQ

Which of the following has least ionisation potential

A

Li

B

Cs

C

Cl

D

I

Question 372: Palette 372/398

Errorless AIIMS 1982; CPMT 1994; MP PMT 2000 MCQ

Which one of the following represents the electronic configuration of the most electropositive element

A

$[He]2s^{1}$

B

$[Xe]6s^{1}$

C

$[He]2s^{2}$

D

$[Xe]6s^{2}$

Question 373: Palette 373/398

Errorless CPMT 1982, 99; Bihar CEE 2006 MCQ

Most electronegative element is

A

Al

B

C

C

Si

D

Be

Question 374: Palette 374/398

Errorless AIIMS 1982 MCQ

Thalium shows different oxidation states because

A

It is a transition element

B

Of inert pair effect

C

Of its amphoteric character

D

Of its higher reactivity

Question 375: Palette 375/398

Errorless CPMT 1982 MCQ

Acidity of pentoxides in VA group

A

Decreases

B

Increases

C

Remains same

D

None

Question 376: Palette 376/398

Errorless IIT 1982 MCQ

The element with the highest first ionization potential is

A

Boron

B

Carbon

C

Nitrogen

D

Oxygen

Question 377: Palette 377/398

Errorless CPMT 1981 MCQ

In the periodic table going down in fluorine group

A

Reactivity will increase

B

Electronegativity will increase

C

Ionic radius will increase

D

Ionisation potential will increase

Question 378: Palette 378/398

Errorless DPMT 1981, 82; CPMT 1984, 89; RPMT 1997; UPSEAT 2001; MP PET 2001, 13; MP PMT 2006 MCQ

Variable valency is a general feature of

A

s-block elements

B

p-block elements

C

d-block elements

D

All of these

Question 379: Palette 379/398

Errorless IIT 1981 MCQ

The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is

A

C > N > O > F

B

O > N > F > C

C

O > F > N > C

D

F > O > N > C

Question 380: Palette 380/398

Errorless CPMT 1979, 93; MP PMT 2011 MCQ

The element X, Y, Z and T have the indicated electronic configurations. Starting with the innermost shell, which is the most metallic element

A

X = 2,8,4

B

Y = 2,8,8

C

Z = 2,8,8,1

D

T = 2,8,8,7

Question 381: Palette 381/398

Errorless EAMCET 1979 MCQ

Which one of the following combination represents a metallic element

A

2,8,7

B

2,8,8

C

2,8,4

D

2,8,2

Question 382: Palette 382/398

Errorless CPMT 1978 MCQ

Element of atomic number 6 is placed in

A

IV group

B

IV period

C

VI group

D

III group

Question 383: Palette 383/398

Errorless CPMT 1976 MCQ

The elements with atomic number 10, 18, 36, 54 and 86 are all

A

Light metals

B

Inert gases

C

Halogens

D

Rare-earths

Question 384: Palette 384/398

Errorless CPMT 1976; Kurukshetra CEE 1998 MCQ

The heaviest atom amongst the following is

A

U

B

Ra

C

Pb

D

Hg

Question 385: Palette 385/398

Errorless CPMT 1976 MCQ

The elements on the right side of the periodic table are

A

Metals

B

Metalloids

C

Non-metals

D

Transition elements

Question 386: Palette 386/398

Errorless CPMT 1976 MCQ

The most important active step in the development of periodic table was taken by

A

Mendeleev

B

Dalton

C

Avogadro

D

Cavendish

Question 387: Palette 387/398

Errorless CPMT 1976 MCQ

Which element has the lowest electronegativity

A

Li

B

F

C

Fe

D

Cl

Question 388: Palette 388/398

Errorless CPMT 1972 MCQ

Who is called the father of chemistry

A

Faraday

B

Priestley

C

Rutherford

D

Lavoiser

Question 389: Palette 389/398

Errorless MCQ

The d -b lock e lements consist mostly of

A

Monovalent metals

B

All non-metals

C

Elements which generally form stoichiometric metal

D

Many metals with catalytic properties

Question 390: Palette 390/398

Errorless MCQ

In the main group elements (i) as we proceed down the same group in the periodic table and (ii) as we proceed from left to right in the same period, the atomic radius

A

(i) Increase continuously; (ii) Decreases continuously

B

(i) Decreases continuously; (ii) Increases continuously

C

(i) Increases continuously; (ii) Decreases upto the group IV and then increases upto the end of the period

D

(i) Decreases continuously; (ii) Decreases upto the group IV and then increases upto the end of the period

Question 391: Palette 391/398

Errorless MCQ

Point out the wrong statement On moving horizontally from left to right across a period in the periodic table

A

Metallic character decreases

B

Electronegativity increases

C

Gram atomic volume first decreases and then increases

D

Size of the atoms increases for normal elements

Question 392: Palette 392/398

Errorless MCQ

Which statement is correct

A

For potassium, the atomic radius < ionic radius; but for bromine, the atomic radius > ionic radius

B

For potassium and bromine both, the atomic radii > ionic radii

C

For potassium and bromine both, the atomic radii < ionic radii

D

For potassium, the atomic radius $>$ ionic radius but for bromine, the atomic radius $<$ ionic radius

Question 393: Palette 393/398

Errorless MCQ

The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation

A

Lesser effective nuclear charge of oxygen than nitrogen

B

Lesser atomic size of oxygen than nitrogen

C

Greater inter-electron repulsion between two electrons in the same $p$ orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen

D

Greater effective nuclear charge of oxygen than nitrogen

E

Higher electronegativity of oxygen than nitrogen

Question 394: Palette 394/398

Errorless MCQ

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species

A

$C l < F < S < O$

B

$S < O < C l < F$

C

$O < S < F < C l$

D

$F < C l < O < S$

Question 395: Palette 395/398

Errorless MCQ

Which element has the greatest tendency to loose electrons

A

F

B

S

C

Fe

D

Be

Question 396: Palette 396/398

Errorless MCQ

The statement that is not correct for the periodic classification Of element is

A

The properties of elements are the periodic functions of their atomic numbers

B

Non-metallic elements are lesser in number than metallic elements

C

The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number

D

For transition elements the d-subshell are filled with electrons monotonically with increase in atomic number

Question 397: Palette 397/398

Errorless MCQ

Identify the correct order of acidic strengths of $CO_{2}$ , CuO, CaO, $H_{2}O$

A

CaO < CuO < $H_{2}O < CO_{2}$

B

$H_{2}O < CuO < CaO < CO_{2}$

C

CaO < $H_{2}O < CuO < CO_{2}$

D

$H_{2}O < CO_{2} < CaO < CuO$

Question 398: Palette 398/398

Errorless MCQ

The incorrect statement is

A

The first ionization enthalpy of $K$ is less than that of Na and Li

B

Xe does not have the lowest first ionization enthalpy in its group

C

The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38

D

The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30