iCON Education - Classification of Elements and Periodicity in Properties Errorless Test

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Student

Exam Name

Errorless

Test Name

Classification of Elements and Periodicity in Properties

Subject

Chemistry-I

← Back to Classification of Elements and Periodicity in Properties

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03:00:00

Question 1: Palette 1/299

Errorless JEE (Main) Jan. 2025 MCQ

The element that does not belong to the same period of the remaining elements (modern periodic table) is

Palladium

Iridium

Osmium

Platinum

Question 2: Palette 2/299

Errorless JEE (Main) Jan. 2025 MCQ

The incorrect decreasing order of atomic radii is

Mg > Al > C > O

Al > B > N > F

Be > Mg > Al > Si

Si > P > Cl > F

Question 3: Palette 3/299

Errorless JEE (Main) Jan. 2025 MCQ

An element ‘E’ has the ionisation enthalpy value of $374\,kJ\,mol^{-1}$ . ‘E’ reacts with elements A, B, C and D with electron grain enthalpy value of -328, -349, -325 and $-295\,kJ\,mol^{-1}$ , respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is

EB > EA > EC > ED

ED > EC > EA > EB

EA > EB > EC > ED

ED > EC > EB > EA

Question 4: Palette 4/299

Errorless JEE (Main) Jan. 2024 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 decreases across a period. Reason R: The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 5: Palette 5/299

Errorless JEE (Main) Jan. 2024 MCQ

The element having the highest first ionization enthalpy is

Question 6: Palette 6/299

Errorless JEE (Main) Jan. 2024 MCQ

Given below are two statements: Statement I : Along the period, the chemical reactivity of the element gradually increases from group 1 to group 18. Statement II : The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic. In the light of the above statements, choose the most appropriate from the options given below

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 7: Palette 7/299

Errorless JEE (Main) Jan. 2024 MCQ

Choose the correct statements about the hydrides of group 15 elements.
(A) The stability of the hydrides decreases in the order $NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3}$
(B) The reducing ability of the hydrides increases in the order $NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3}$
(C) Among the hydrides, $NH_{3}$ is strong reducing agent while $BiH_{3}$ is mild reducing agent
(D) The basicity of the hydrides increases in the order $NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3}$ Choose the most appropriate from the options given below

(B) and (C) only

(A) and (B) only

(A) and (D) only

Question 8: Palette 8/299

Errorless JEE (Main) Jan. 2024 MCQ

The correct sequence of electron gain enthalpy of the elements Columned below is A. Ar B. Br C. F D. S Choose the most appropriate from the options given below

C > B > D > A

A > D > B > C

A > D > C > B

D > C > B > A

Question 9: Palette 9/299

Errorless JEE (Main) Jan. 2024 MCQ

Consider the following elements. Group $\downarrow$ A'B' $\longrightarrow$ Period C'D' Which of the following is/are true about A', B', C' and D' A. Order of atomic radii: B' < A' < D' < C'. B. Order of metallic character: B' < A' < D' < C'. C. Size of the element: D' < C' < B' < A'. D. Order of ionic radii: B' + < A' + < D' + < C' +. Choose the correct answer from the options given below

A only

A, B and D only

A and B only

B, C and D only

Question 10: Palette 10/299

Errorless JEE (Main) Jan. 2024 MCQ

In case of isoelectronic species the size of $F^{-}$ , Ne and $Na^{+}$ is affected by

Principal quantum number (n)

None of the factors because their size is the same

Electron-electron interaction in the outer orbitals

Nuclear charge (z)

Question 11: Palette 11/299

Errorless JEE (Main) Jan. 2024 MCQ

Given below are two statements: Statement I: Both metal and non-metal exist in p and d-block elements. Statement II: Non-metals have higher ionization enthalpy and higher electronegativity than the metals. In the light of the above statements, choose the most appropriate answer from the options given below

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 12: Palette 12/299

Errorless JEE (Main) Jan. 2023 MCQ

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

$C > A > E > B > D$

$E > C > A > B > D$

$C > E > A > D > B$

$C > E > A > B > D$

Question 13: Palette 13/299

Errorless JEE (Main) Jan. 2023 MCQ

Given below are two statements: Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement II : The d orbitals in Ga are completely filled. In the light of the above statements, choose the most appropriate answer from the options given below

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 14: Palette 14/299

Errorless JEE (Main) Jan. 2023, April 2024 MCQ

Match Column-I (Atomic number) with Column-II (Block of periodic table)
Choose the correct answer from the options given below

Column-I

Column-II

(P)	37
(Q)	78
(R)	52
(S)	65

(I)	p-block
(II)	d-block
(III)	f-block
(IV)	s-block

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

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

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

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

Question 15: Palette 15/299

Errorless JEE (Main) April 2023 MCQ

The difference between electron gain enthalpies will be maximum between

Ne and F

Ne and Cl

Ar and Cl

Ar and F

Question 16: Palette 16/299

Errorless JEE (Main) April 2023 MCQ

The correct order of electronegativity for given elements is

C > P > At > Br

Br > P > At > C

P > Br > C > At

Br > C > At > P

Question 17: Palette 17/299

Errorless JEE (Main) April 2023 MCQ

For elements $B, C, N, Li, Be, O$ and $F$ the correct order of first ionization enthalpy is

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

$B > Li > Be > C > N > O > F$

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

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

Question 18: Palette 18/299

Errorless JEE (Main) April 2023 MCQ

The pair of lanthanides in which both elements have high third-ionization energy is

Eu, Gd

Eu, Yb

Lu, Yb

Dy, Gd

Question 19: Palette 19/299

Errorless JEE (Main) June 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

Question 20: Palette 20/299

Errorless JEE (Main) June 2022 MCQ

Which of the following elements in considered as a metalloid

Question 21: Palette 21/299

Errorless JEE (Main) June 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

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

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

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

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

Question 22: Palette 22/299

Errorless JEE (Main) June 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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 23: Palette 23/299

Errorless JEE (Main) June 2022 MCQ

Among the following basic oxide is

$SO_{3}$

$SiO_{2}$

CaO

$Al_{2}O_{3}$

Question 24: Palette 24/299

Errorless JEE (Main) June 2022 MCQ

The electronic configuration of Pt (atomic number 78) is

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

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

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

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

Question 25: Palette 25/299

Errorless JEE (Main) June 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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 26: Palette 26/299

Errorless JEE (Main) July 2022 MCQ

The IUPAC nomenclature of an element with electronic configuration $[Rn]5f^{14}6d^{1}7s^{2}$ is

Unnilbium

Unnilunium

Unnilquadium

Unniltrium

Question 27: Palette 27/299

Errorless JEE (Main) July 2022 MCQ

Choose the correct order of density of the alkali metals

$$ L i < K < N a < R b < C s $$

$$ L i < N a < K < R b < C s $$

$$ C s < R b < K < N a < L i $$

$$ L i < N a < K < C s < R b $$

Question 28: Palette 28/299

Errorless JEE (Main) July 2022 MCQ

The correct order of density is

Be > Mg > Ca > Sr

Sr > Ca > Mg > Be

Sr > Be > Mg > Ca

Be > Sr > Mg > Ca

Question 29: Palette 29/299

Errorless JEE (Main) July 2022 MCQ

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

Question 30: Palette 30/299

Errorless JEE (Main) July 2022 MCQ

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

Question 31: Palette 31/299

Errorless JEE (Main) July 2022 MCQ

The incorrect statement is

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

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

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

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

Question 32: Palette 32/299

Errorless JEE (Main) July 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) < (B) < (C) < (D)

(B) < (A) < (D) < (C)

(B) < (D) < (A) < (C)

(B) < (A) < (C) < (D)

Question 33: Palette 33/299

Errorless JEE (Main) July 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

Question 34: Palette 34/299

Errorless JEE (Main) July 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) and (B) only

(B) and (C) only

(A) and (C) only

Question 35: Palette 35/299

Errorless JEE (Main) July 2022, Jan. 2023 MCQ

The correct decreasing order for metallic character is

Na > Mg > Be > Si > P

P > Si > Be > Mg > Na

Si > P > Be > Na > Mg

Be > Na > Mg > Si > P

Question 36: Palette 36/299

Errorless JEE (Main) July 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

487

768

577

856

Question 37: Palette 37/299

Errorless JEE (Main) Feb. 2021 MCQ

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

$Cr < Zn < Co < Cu < Fe$

$Zn < Cu < Co < Fe < Cr$

$Zn < Cr < Fe < Co < Cu$

$Cr < Fe < Co < Cu < Zn$

Question 38: Palette 38/299

Errorless JEE (Main) Feb. 2021 MCQ

The incorrect statement among the following is

$VOSO_4$ is a reducing agent

$Cr_2O_3$ is an amphoteric oxide

$RuO_4$ is an oxidizing agent

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

Question 39: Palette 39/299

Errorless JEE (Main) Feb. 2021 MCQ

The correct order of bond dissociation enthalpy of halogens is

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

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

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

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

Question 40: Palette 40/299

Errorless JEE (Main) Feb. 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)	1s²2s²
(Q)	1s²2s²2p⁴
(R)	1s²2s²2p³
(S)	1s²2s²2p¹

(I)	801
(II)	899
(III)	1314
(IV)	1402

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

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

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

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

Question 41: Palette 41/299

Errorless JEE (Main) Feb. 2021 MCQ

The correct order of electron gain enthalpy is

$S > Se > Te > O$

$Te > Se > S > O$

$O > S > Se > Te$

$S > O > Se > Te$

Question 42: Palette 42/299

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

$X = Na;Y = Mg$

$X = Mg;Y = F$

$X = Mg;Y = Na$

$X = F;Y = Mg$

Question 43: Palette 43/299

Errorless JEE (Main) March 2021 MCQ

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

X and Y are metalloids and Z is a metal

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

X, Y and Z are metals

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

Question 44: Palette 44/299

Errorless JEE (Main) March 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

1.05 and 0.99

0.72 and 0.54

0.85 and 0.99

0.68 and 0.72

Question 45: Palette 45/299

Errorless JEE (Main) March 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

Chlorine, lithium and sodium

Argon, lithium and sodium

Argon, chlorine and sodium

Neon, sodium and chlorine

Question 46: Palette 46/299

Errorless JEE (Main) July 2021 MCQ

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

He authored the textbook – Principles of Chemistry

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

Element with atomic number 101 is named after him

He invented accurate barometer

Question 47: Palette 47/299

Errorless JEE (Main) Aug. 2021 MCQ

Given below are tuto statements one labeled as Assertion (A) and the other is labelled as Reason 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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 48: Palette 48/299

Errorless JEE (Main) Aug. 2021 MCQ

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

Br > I > Cl

I > Cl > Br

Br > Cl > I

Cl > I > Br

Question 49: Palette 49/299

Errorless JEE (Main) March 2021, June 2022 MCQ

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

F < Cl < Te < Po

Po < Te < F < Cl

Te < Po < Cl < F

Cl < F < Te < Po

Question 50: Palette 50/299

Errorless JEE (Main) Jan. 2020 MCQ

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

-333, -349, -325 and -296

-296, -325, -333 and -349

-333, -325, -349 and -296

-349, -333, -325 and -296

Question 51: Palette 51/299

Errorless JEE (Main) Jan. 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

$F$ , $Se$ and $Na$

$F$ , $S$ and $Li$

$Cl$ , $S$ and $Li$

$Cl$ , $Se$ and $Na$

Question 52: Palette 52/299

Errorless JEE (Main) Jan. 2020 MCQ

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

496, 737, 577, 786

786, 737, 577, 496

496, 577, 737, 786

496, 577, 786, 737

Question 53: Palette 53/299

Errorless JEE (Main) Jan. 2020 MCQ

The third ionization enthalpy is minimum for

Question 54: Palette 54/299

Errorless JEE (Main) Jan. 2020 MCQ

The increasing order of the atomic radii of the following elements is
(A) C(B) O(C) F(D) Cl(E) Br

(B) < (C) < (D) < (A) < (E)

(A) < (B) < (C) < (D) < (E)

(D) < (C) < (B) < (A) < (E)

Question 55: Palette 55/299

Errorless JEE (Main) Jan. 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

(I), (II) and (III)

(II), (III) and (IV)

(I), (III) and (IV)

(I), (II) and (IV)

Question 56: Palette 56/299

Errorless JEE (Main) Jan. 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

1 and 0.5

2 and 0.5

1 and 1

1 and 2

Question 57: Palette 57/299

Errorless JEE (Main) Sep. 2020 MCQ

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

Electronegativity

Electron gain enthalpy

Ionization enthalpy

Atomic radius

Question 58: Palette 58/299

Errorless JEE (Main) Sep. 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

X < Y < Z

Z < Y < X

X < Z < Y

Y < X < Z

Question 59: Palette 59/299

Errorless JEE (Main) Sep. 2020 MCQ

The atomic number of the element unnilennium is

119

109

108

102

Question 60: Palette 60/299

Errorless JEE (Main) Sep. 2020 MCQ

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

Actinoids and Group 4

Group 11 and Group 4

Group 6 and Actinoids

Actinoids and Group 6

Question 61: Palette 61/299

Errorless JEE (Main) Sep. 2020 MCQ

In the sixth period, the orbitals that are filled are

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

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

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

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

Question 62: Palette 62/299

Errorless JEE (Main) Jan. 2019 MCQ

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

Electronegativity and electron gain enthalpy

Electronegativity and atomic radius

Atomic radius and electronegativity

Electron gain enthalpy and electronegativity

Question 63: Palette 63/299

Errorless JEE (Main) Jan. 2019 MCQ

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

Almost the same as that of the first

Negative, but less negative than the first

A positive value

A more negative value than the first

Question 64: Palette 64/299

Errorless JEE (Main) Jan. 2019 MCQ

The electronegativity of aluminium is similar to

Boron

Carbon

Lithium

Beryllium

Question 65: Palette 65/299

Errorless JEE (Main) Jan. 2019 MCQ

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

Question 66: Palette 66/299

Errorless JEE (Main) Jan. 2019 MCQ

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

S < C < Al < Cs

S < C < Cs < Al

C < S < Cs < Al

C < S < Al < Cs

Question 67: Palette 67/299

Errorless JEE (Main) Jan. 2019 MCQ

The amphoteric hydroxide is

$Ca(OH)_{2}$

$Be(OH)_{2}$

$Sr(OH)_{2}$

$Mg(OH)_{2}$

Question 68: Palette 68/299

Errorless JEE (Main) Jan. 2019 MCQ

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

$Ga < Ge$

$Si < Al$

$P > S$

$Te > Se$

Question 69: Palette 69/299

Errorless JEE (Main) Jan. 2019 MCQ

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

Transition metal

Inner-transition metal

Alkaline earth metal

Alkali metal

Question 70: Palette 70/299

Errorless JEE (Main) Jan. 2019 MCQ

The correct order of atomic radii is

Ce > Eu > Ho > N

N > Ce > Eu > Ho

Eu > Ce > Ho > N

Ho > N > Eu > Ce

Question 71: Palette 71/299

Errorless JEE (Main) April 2019 MCQ

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

unh

uun

une

uue

Question 72: Palette 72/299

Errorless JEE (Main) April 2019 MCQ

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

Question 73: Palette 73/299

Errorless JEE (Main) April 2019 MCQ

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

16, 5 and 2

16, 6 and 3

15, 5 and 3

15, 6 and 2

Question 74: Palette 74/299

Errorless JEE (Main) April 2019 MCQ

The pair that has similar atomic radii is

Sc and Ni

Ti and HF

Mo and W

Mn and Re

Question 75: Palette 75/299

Errorless NEET 2018 MCQ

The correct order of atomic radii in group 13 elements is

B < Al < In < Ga < Tl

B < Al < Ga < In < Tl

B < Ga < Al < Tl < In

B < Ga < Al < In < Tl

Question 76: Palette 76/299

Errorless JEE (Main) 2017 MCQ

The group having isoelectronic species is

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

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

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

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

Question 77: Palette 77/299

Errorless JEE (Main) 2015 MCQ

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

1.36, 1.40 and 1.71

1.36, 1.71 and 1.40

1.71, 1.40 and 1.36

1.71, 1.36 and 1.40

Question 78: Palette 78/299

Errorless CBSE PMT 2014; KCET 2018 MCQ

Which of the following orders of ionic radii is correctly represented

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

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

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

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

Question 79: Palette 79/299

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

Al < Ca < O < C < F

Al < O < C < Ca < F

C < F < O < Al < Ca

Ca < Al < C < O < F

Question 80: Palette 80/299

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

2.0

2.5

2.75

3.06

Question 81: Palette 81/299

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

$Ca < S < Ba < Se < Ar$

$S < Se < Ca < Ba < Ar$

$Ba < Ca < Se < S < Ar$

$Ca < Ba < S < Se < Ar$

Question 82: Palette 82/299

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

-2.55 eV

-5.1 eV

-10.2 eV

+2.55 eV

Question 83: Palette 83/299

Errorless J & K CET 2012 MCQ

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

Protons

Electrons

Neutrons

Mesons

Question 84: Palette 84/299

Errorless CBSE PMT (Pre.) 2012 MCQ

Identify the wrong statement in the following

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

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

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

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

Question 85: Palette 85/299

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

$Na < Mg < He$

$Mg < Na < He$

$Mg < He < Na$

$Na < He < Mg$

Question 86: Palette 86/299

Errorless J & K CET 2012 MCQ

The most stable oxidation state exhibited by thallium is

Question 87: Palette 87/299

Errorless WB JEE 2012 MCQ

The stable bivalency of Pb and trivalency of Bi is

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

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

Due to screening effect

Due to attainment of noble configuration

Question 88: Palette 88/299

Errorless Odisha JEE 2012 MCQ

Which of the following is not a periodic property

Electronegativity

Atomic volume

Covalent radii

Atomic mass

Question 89: Palette 89/299

Errorless Odisha JEE 2011 MCQ

Which of the following has the largest size

$S^{2-}$

$Se^{2-}$

$O^{2-}$

$Te^{2-}$

Question 90: Palette 90/299

Errorless CBSE PMT (Mains) 2010 MCQ

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

$Mg < Ca < Cl < P$

$Cl < P < Mg < Ca$

$P < Cl < Ca < Mg$

$Ca < Mg < P < Cl$

Question 91: Palette 91/299

Errorless CBSE PMT (Mains) 2010 MCQ

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

CsI

CsF

LiF

NaF

Question 92: Palette 92/299

Errorless AMU (Engg.) 2010 MCQ

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

Na and Li

Li and Rb

K and Na

Cs and Na

Question 93: Palette 93/299

Errorless AMU (Med.) 2010 MCQ

Among the following, the third ionisation energy is highest for

Magnesium

Boron

Beryllium

Aluminium

Question 94: Palette 94/299

Errorless J & K CET 2010 MCQ

Which element is expected to have lowest first ionisation energy

Question 95: Palette 95/299

Errorless CPMT 2010 MCQ

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

$P, Si, Se, Br, N$

$Si, Se, P, Br, N$

$Si, P, Se, Br, N$

$Se, P, Si, Br, N$

Question 96: Palette 96/299

Errorless WB JEE 2010 MCQ

In a periodic table the basic character of oxides

Increases from left to right and decreases from top to bottom

Decreases from right to left and increases from top to bottom

Decreases from left to right and increases from top to bottom

Decreases from left to right and increases from bottom to top

Question 97: Palette 97/299

Errorless AMU (Engg.) 2009 MCQ

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

Noble gas family

Alkali family

Alkaline earth family

Halogen family

Question 98: Palette 98/299

Errorless J & K CET 2009 MCQ

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

Question 99: Palette 99/299

Errorless DCE 2009 MCQ

Which is not the correct order for the stated property

$Ba > Sr > Mg$ : atomic radius

$F > O > N$ : first ionisation enthalpy

$Cl > F > I$ : electron affinity

$O > Se > Te$ : electronegativity

Question 100: Palette 100/299

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

0.0065, +2

0.095, +1

0.135, +2

0.169, +1

0.181, -1

Question 101: Palette 101/299

Errorless Kerala PET 2008 MCQ

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

Lesser effective nuclear charge of oxygen than nitrogen

Lesser atomic size of oxygen than nitrogen

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

Question 102: Palette 102/299

Errorless KCET 2008 MCQ

The correct order in which the first ionisation potential increases is

$K, Be, Na$

$Be, Na, K$

$Na, K, Be$

$K, Na, Be$

Question 103: Palette 103/299

Errorless Kerala PMT 2008 MCQ

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

H and O

Cl and F

Mg and N

P and O

Cs and F

Question 104: Palette 104/299

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

Identify the correct order of the size of the following

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

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

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

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

Question 105: Palette 105/299

Errorless UPCPMT 2007 MCQ

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

Larger radii and large size

Smaller radii and large size

Larger radii and small size

Smaller radii and small size

Question 106: Palette 106/299

Errorless CBSE PMT 2007 MCQ

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

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

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

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

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

Question 107: Palette 107/299

Errorless CBSE PMT 2007 MCQ

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

$HS^{-}$

$NH_{2}^{-}$

$F^{-}$

$I^{-}$

Question 108: Palette 108/299

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

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

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

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

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

Question 109: Palette 109/299

Errorless AIEEE 2006; AFMC 2012 MCQ

The increasing order of the first ionisation enthalpies of the elements $B, P, S$ and $F$ (lowest first) is

$F < S < P < B$

$P < S < B < F$

$B < P < S < F$

$B < S < P < F$

Question 110: Palette 110/299

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 and C

B and D

B and E

Only D

Only C

Question 111: Palette 111/299

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.

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 112: Palette 112/299

Errorless DCE 2006; AFMC 2010 MCQ

Which of the following species has the highest electron affinity

$F^{-}$

$O^{-}$

$Na^{+}$

Question 113: Palette 113/299

Errorless J & K CET 2006 MCQ

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

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

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

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

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

Question 114: Palette 114/299

Errorless CBSE PMT 2005, 04 MCQ

Ionic radii are

Directly proportional to effective nuclear charge

Directly proportional to square of effective nuclear charge

Inversely proportional to effective nuclear charge

Inversely proportional to square of effective nuclear charge

Question 115: Palette 115/299

Errorless AIIMS 2005 MCQ

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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 116: Palette 116/299

Errorless CBSE PMT 2005; CBSE PMT (Pre.) 2010 MCQ

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

Cl < F < S < O

O < S < F < Cl

S < O < Cl < F

F < Cl < O < S

Question 117: Palette 117/299

Errorless AIIMS 2005 MCQ

The pair of amphoteric hydroxides is

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

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

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

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

Question 118: Palette 118/299

Errorless BHU 2005 MCQ

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

Li > Na > K

K > Li > Na

Na > Li > K

Li > K > Na

Question 119: Palette 119/299

Errorless AIEEE 2005, JEE (Main) Jan. 2025 MCQ

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

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

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

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

Li < Na < K < Rb : Increasing metallic radius

Question 120: Palette 120/299

Errorless AIEEE 2005 MCQ

Which of the following oxides is amphoteric in character

CaO

$\mathrm{CO}_{2}$

$\mathrm{SiO}_2$

$\mathrm{SnO}_2$

Question 121: Palette 121/299

Errorless Odisha JEE 2005; JEE (Main) Sep. 2020, Jul. 2021, Aug. 2021, June 2022, Jan. 2023 MCQ

The correct increasing order of the ionic radii is

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

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

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

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

Question 122: Palette 122/299

Errorless KCET 2004; AFMC 2012 MCQ

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

Noble gases

Halogens

Heavy metals

Light metals

Question 123: Palette 123/299

Errorless DPMT 2004 MCQ

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

$Rb^{+}$

$Cs^{+}$

$Li^{+}$

$Na^{+}$

Question 124: Palette 124/299

Errorless Pb.PMT 2004 MCQ

The trivalent ion having largest size in lanthanide series is

Question 125: Palette 125/299

Errorless Odisha JEE 2004 MCQ

Correct energy value order is

ns np nd(n-1)f

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

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

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

Question 126: Palette 126/299

Errorless Odisha JEE 2004 MCQ

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

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

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

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

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

Question 127: Palette 127/299

Errorless BHU 2004 MCQ

Which of the following has the highest first ionisation energy

Question 128: Palette 128/299

Errorless Kerala PMT 2004; WB JEE 2008 MCQ

In a given shell, the order of screening effect is

s > p > d > f

f > d > p > s

p < d < s < f

d > f < s > p

f > p > s > d

Question 129: Palette 129/299

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

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

Oxygen has high electron affinity

Oxygen is more electronegative

Question 130: Palette 130/299

Errorless AIEEE 2004 MCQ

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

Hydration enthalpy

Ionisation enthalpy

Electron affinity

Bond dissociation energy

Question 131: Palette 131/299

Errorless AFMC 2004 MCQ

Which of these have no unit

Electronegativity

Electron affinity

Ionisation energy

Excitation potential

Question 132: Palette 132/299

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

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

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

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

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

Question 133: Palette 133/299

Errorless AIEEE 2004 MCQ

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

Forming covalent halides

Forming polymeric hydrides

Exhibiting maximum covalency in compounds

Exhibiting amphoteric nature in their oxides

Question 134: Palette 134/299

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)

Atomic size decrease

Ionisation energy increase

Metallic character decrease

Stability of $+2$ oxidation state increase

Question 135: Palette 135/299

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

Which of the following show diagonal relationship

B and Si

B and Al

B and Ga

B and C

Question 136: Palette 136/299

Errorless AIEEE 2003 MCQ

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

Atomic masses

Nuclear masses

Atomic numbers

Nuclear neutron-proton number

Question 137: Palette 137/299

Errorless MP PMT 2003; BHU 2003 MCQ

Correct order of polarising power is

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

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

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

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

Question 138: Palette 138/299

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

Electron affinity

Ionisation potential

Electronegativity

Size of atom

Question 139: Palette 139/299

Errorless Kerala PMT 2003 MCQ

An atom with high electronegativity has

Large size

High ionisation potential

Low electron affinity

Low ionisation potential

Question 140: Palette 140/299

Errorless AIEEE 2003 MCQ

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

Lattice energies of solids

Hydration energies of cations

Inter-ionic attraction

Question 141: Palette 141/299

Errorless DCE 2003 MCQ

The polarising ability of which one of the following is highest

Small highly +ve ion

Large +ve ion

Small highly -ve ion

Large -ve ion

Question 142: Palette 142/299

Errorless Kerala PMT 2003 MCQ

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

Increases one by one from IA to VIIA

Decreases one by one from IA to VIIA

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

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

Question 143: Palette 143/299

Errorless UPSEAT 2003 MCQ

Which will show maximum non-metallic character

$B$

$Mg$

Question 144: Palette 144/299

Errorless RPET 2003 MCQ

Increasing order of electronegativity is

Bi < P < S < Cl

P < Bi < S < Cl

S < Bi < P < Cl

Cl < S < Bi < P

Question 145: Palette 145/299

Errorless AMU 2002 MCQ

Which of the following has smallest bond angle

$H_{2}O$

$NH_{3}$

$CH_{4}$

$CO_{2}$

Question 146: Palette 146/299

Errorless AMU 2002 MCQ

The metal-having highest melting point is

Chromium

Tungsten

Diamond

Silver

Question 147: Palette 147/299

Errorless BHU 2002 MCQ

Which of the following is the correct order of ionic radii

$F > Li > Na > K$

$F > K > Na > Li$

$Na > K > F > Li$

$Li > Na > K > F$

Question 148: Palette 148/299

Errorless KCET 2002 MCQ

Chloride ion and potassium ion are isoelectronic. Then

Potassium ion is relatively bigger

Depends on the other cation and anion

Their size are same

Chloride ion is bigger than potassium ion

Question 149: Palette 149/299

Errorless CBSE PMT 2002; AFMC 2012 MCQ

Which of the following order is wrong

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

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

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

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

Question 150: Palette 150/299

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

Reactivity of phosphorus

Inert nature of nitrogen

Dissimilar electronic configuration

Larger size of phosphorus atom

Question 151: Palette 151/299

Errorless AIEEE 2002 MCQ

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

Ce > Sn > Yb > Lu

Sn > Ce > Lu > Yb

Lu > Yb > Sn > Ce

Sn > Yb > Ce > Lu

Question 152: Palette 152/299

Errorless CBSE PMT 2001 MCQ

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

Question 153: Palette 153/299

Errorless IIT JEE 2001 MCQ

The set representing the correct order of first ionisation potential is

K > Na > Li

Be > Mg > Ca

B > C > N

Ge > Si > C

Question 154: Palette 154/299

Errorless AIIMS 2000 MCQ

Which of the following is the atomic number of a metal

Question 155: Palette 155/299

Errorless AIIMS 2000 MCQ

Which of the following statement is not correct regarding hydrogen atom

It resembles halogens in some properties

It resembles alkali metals in some properties

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

It can not be placed in first group of periodic table

Question 156: Palette 156/299

Errorless DPMT 2000 MCQ

Which configuration represents a noble gas

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

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

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

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

Question 157: Palette 157/299

Errorless MP PET 2000 MCQ

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

$Na^{+}$

$Al^{3+}$

$Be^{2+}$

$Cr^{3+}$

Question 158: Palette 158/299

Errorless RPET 2000 MCQ

Highest density is of ......

Question 159: Palette 159/299

Errorless RPET 2000 MCQ

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

$[Ar]4s^{1}$

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

$[Ne]3s^{2}$

None of these

Question 160: Palette 160/299

Errorless RPET 2000 MCQ

Group comprising of all metals is

III A

IV A

VII A

II A

Question 161: Palette 161/299

Errorless RPET 2000 MCQ

Astatine is a

Halogen

Rare earth element

Alkaline earth metal

None of these

Question 162: Palette 162/299

Errorless MP PET 2000 MCQ

Which one of the following should be most stable

$H_{2}^{+}$

$H^{+}$

$H$

$H^{-}$

Question 163: Palette 163/299

Errorless AIIMS 2000; MP PMT 2002 MCQ

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

B < C < N

B > C > N

C < B < N

N > C > B

Question 164: Palette 164/299

Errorless BHU 2000; MH CET 2003 MCQ

The correct order of reactivity of halogens is

F > Cl > Br > I

F < Cl > Br < I

F < Cl < Br < I

F < Cl I

Question 165: Palette 165/299

Errorless RPMT 2000 MCQ

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

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

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

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

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

Question 166: Palette 166/299

Errorless RPET 2000 MCQ

In which of the following process highest energy is absorbed

$Cu \rightarrow Cu^{+}$

$Br \rightarrow Br^{-}$

$I \rightarrow I^{-}$

$Li \rightarrow Li^{+}$

Question 167: Palette 167/299

Errorless AMU 2000 MCQ

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

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

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

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

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

Question 168: Palette 168/299

Errorless MP PET 2000 MCQ

The correct order of the increasing ionic character is

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

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

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

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

Question 169: Palette 169/299

Errorless DCE 2000 MCQ

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

s - block

p - block

d - block

f - block

Question 170: Palette 170/299

Errorless IIT 2000 MCQ

The correct order of radii is

$N < Be < B$

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

$Na < Li < K$

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

Question 171: Palette 171/299

Errorless IIT 2000 MCQ

The correct order of acidic strength is

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

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

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

$K_{2}O > CaO > MgO$

Question 172: Palette 172/299

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

$H_{2}O$ because of hydrogen bonding

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

$H_{2}S$ because of hydrogen bonding

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

Question 173: Palette 173/299

Errorless IIT Screening 2000 MCQ

Statement 1 : The first ionisation energy of Be is greater than that of B. Statement 2 : 2p orbital is lower in energy than 2s orbital.

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 174: Palette 174/299

Errorless DCE 1999 MCQ

Whose name is not associated with the development of Periodic Table

Prout's

Newlands

Rutherford

Loother Meyer

Question 175: Palette 175/299

Errorless AIIMS 1999; CPMT 1999 MCQ

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

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

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

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

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

Question 176: Palette 176/299

Errorless AIIMS 1999 MCQ

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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 177: Palette 177/299

Errorless AIIMS 1999 MCQ

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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 178: Palette 178/299

Errorless AIIMS 1999 MCQ

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

Large size

Small size

Ionic bond

Covalent bond

Question 179: Palette 179/299

Errorless MP PET 1999 MCQ

Which of the following metals exhibits more than one oxidation state

Question 180: Palette 180/299

Errorless RPET 1999 MCQ

Which of the following elements is found in native state

Question 181: Palette 181/299

Errorless RPET 1999 MCQ

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

Ionisation potential

Electronegativity

Electron affinity

Number of electrons in the valence shell

Question 182: Palette 182/299

Errorless KCET (Med.) 1999 MCQ

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

They are non-metals

They are electronegative

Their atoms are generally univalent

They have 7 electrons in the outermost shell of their atom

Question 183: Palette 183/299

Errorless IIT JEE 1999 MCQ

Ionic radii of

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

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

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

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

Question 184: Palette 184/299

Errorless AIIMS 1998 MCQ

Which of the following elements are analogous to the lanthanides

Actinides

Borides

Carbides

Hydrides

Question 185: Palette 185/299

Errorless Kurukshetra CEE 1998; AFMC 2000 MCQ

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

$N, O$

$Na, Ca$

As, Bi

$Pb, Sb$

Question 186: Palette 186/299

Errorless MP PET/PMT 1998 MCQ

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

Third

Fourth

Fifth

Sixth

Question 187: Palette 187/299

Errorless CET Pune 1998 MCQ

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

Transition elements

Lanthanides

Actinides

Rare gases

Question 188: Palette 188/299

Errorless CBSE PMT 1998 MCQ

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

$8.29\mathrm{eV}$ , $9.32\mathrm{eV}$

$9.32\mathrm{eV}$ , $9.32\mathrm{eV}$

$8.29\mathrm{eV}$ , $8.29\mathrm{eV}$

$9.32\mathrm{eV}$ , $8.29\mathrm{eV}$

Question 189: Palette 189/299

Errorless CET Pune 1998; AFMC 2001; BVP 2003 MCQ

Ionisation energy is highest for

Noble gases

Platinum metals

Transition elements

Inner-transition elements

Question 190: Palette 190/299

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

The electron affinity for the inert gases is

Zero

High

Negative

Positive

Question 191: Palette 191/299

Errorless MP PET/PMT 1998 MCQ

Which element has the highest electronegativity

Question 192: Palette 192/299

Errorless CBSE PMT 1998 MCQ

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

$Eu$

$La$

$Gd$

$Am$

Question 193: Palette 193/299

Errorless IIT JEE 1998 MCQ

Statement 1 : LiCl is predominantly a covalent compound. Statement 2 : Electronegativity difference between Li and Cl is too small.

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 194: Palette 194/299

Errorless IIT JEE 1998 MCQ

Statement 1 : F atom has a less negative electron affinity than Cl atom. Statement 2 : Additional electrons are repelled more effectively by $3p$ electrons in $Cl$ atom than by $2p$ electrons in $F$ atom.

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 195: Palette 195/299

Errorless RPMT 1997; EAMCET 1998 MCQ

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

Atomic volume

Electronic configuration

Atomic weight

Atomic size

Question 196: Palette 196/299

Errorless MP PET 1997 MCQ

Who developed the long form of periodic table

Lothar Meyer

Niels Bohr

Mendeleev

Moseley

Question 197: Palette 197/299

Errorless EAMCET 1997; BHU 1999 MCQ

Of the following, the one with largest size is

$Cl^{-}$

$K^{+}$

$Ca^{2+}$

Question 198: Palette 198/299

Errorless MP PET 1997 MCQ

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

Na K Rb Cs

Li Be B C

Fe Co Ni Cu

F Cl Br I

Question 199: Palette 199/299

Errorless JIPMER 1997; CPMT 1997; AIIMS 2000 MCQ

Which of the following gaseous atoms has highest value of IE

Question 200: Palette 200/299

Errorless RPMT 1997; DCE 1999; BHU 2006 MCQ

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

Greater attraction of electrons by the nucleus

The size of nitrogen atom being smaller

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

Greater penetration effect

Question 201: Palette 201/299

Errorless CPMT 1997 MCQ

Fluorine has low electron affinity than chlorine because of

Smaller radius of fluorine, high density

Smaller radius of chlorine, high density

Bigger radius of fluorine, less density

Smaller radius of chlorine, less density

Question 202: Palette 202/299

Errorless MP PET 1997; J & K CET 2005 MCQ

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

O > C > N > B

B > N > C > O

O > C > B > N

O > B > C > N

Question 203: Palette 203/299

Errorless IIT 1997 MCQ

The incorrect statement among the following is

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

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

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

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

Question 204: Palette 204/299

Errorless IIT 1997 MCQ

Which of the following compounds is expected to be coloured

$Ag_{2}SO_{4}$

$CuF_{2}$

$MgF_{2}$

$CuCl$

Question 205: Palette 205/299

Errorless BHU 1996; AMU 2000 MCQ

Which of the following is metalloid

None of these

Question 206: Palette 206/299

Errorless DPMT 1996 MCQ

Last element of group-IV is found to be

Strong metallic

Weak metallic

Strong non-metallic

Weak non-metallic

Question 207: Palette 207/299

Errorless MP PET 1996; MP PMT 1996 MCQ

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

Atomic number

Electronic configuration

Atomic weight

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

Question 208: Palette 208/299

Errorless MP PET 1996 MCQ

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

Transition elements

Lanthanides

Actinides

Inert gases

Question 209: Palette 209/299

Errorless MP PET 1996 MCQ

Of the following the ion with the smallest ionic radius is

$K^{+}$

$Ca^{2+}$

$Ti^{3+}$

$Ti^{4+}$

Question 210: Palette 210/299

Errorless CPMT 1996; DCE 2001 MCQ

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

-13.6 eV

13.6 eV

-3.4 eV

3.4 eV

Question 211: Palette 211/299

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

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

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

There is no change in the nuclear charge

None of the above

Question 212: Palette 212/299

Errorless KCET 1996 MCQ

Which of the following species has lowest ionisation potential

$O$

$O_{2}$

$O_{2}^{+}$

$O_{2}^{-}$

Question 213: Palette 213/299

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

Electron capacity

Electron affinity

Ionisation potential

Electronegativity

Question 214: Palette 214/299

Errorless IIT 1996 MCQ

Which of the following has the maximum number of unpaired electrons

$Mg^{2+}$

$Ti^{3+}$

$V^{3+}$

$Fe^{2+}$

Question 215: Palette 215/299

Errorless IIT JEE 1996 MCQ

Which one of the following oxides is neutral

$SnO_2$

ZnO

$SiO_2$

Question 216: Palette 216/299

Errorless AFMC 1995 MCQ

The most common lanthanide is

Lanthanum

Cerium

Samarium

Plutonium

Question 217: Palette 217/299

Errorless MP PMT 1995 MCQ

The element with atomic number 55 belongs to

s-block

p-block

d-block

f-block

Question 218: Palette 218/299

Errorless AFMC 1995, 97; CPMT 1999 MCQ

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

Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

Question 219: Palette 219/299

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

Which of the following has largest size

$Al^{+}$

$Al^{+2}$

$Al^{+3}$

Question 220: Palette 220/299

Errorless MP PET 1995 MCQ

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

Decreases

Increases

Remain constant

First decreases and then increases

Question 221: Palette 221/299

Errorless Roorkee (IIT) 1995 MCQ

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

-54.4 eV

-13.6 eV

-27.2 eV

+27.2 eV

Question 222: Palette 222/299

Errorless IIT 1995 MCQ

Which has most stable +2 oxidation state

Question 223: Palette 223/299

Errorless Roorkee (IIT) 1995 MCQ

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

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

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

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

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

Question 224: Palette 224/299

Errorless Roorkee (IIT) 1995 MCQ

Which one of the elements has the maximum electron affinity

$F$

$Cl$

$Br$

$I$

Question 225: Palette 225/299

Errorless Roorkee (IIT) 1995 MCQ

Which element has the highest electronegativity

$F$

$Ne$

$Na$

Question 226: Palette 226/299

Errorless MP PMT 1994 MCQ

The $d$ -block elements consist mostly of

Monovalent metals

All non-metals

Elements which generally form stoichiometric metal oxide

Many metals with catalytic properties

Question 227: Palette 227/299

Errorless MP PMT 1994 MCQ

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

The element's valency is 7

The element exists as a diatomic molecule

The element is of non-metallic nature

The element forms a basic oxide

Question 228: Palette 228/299

Errorless MP PET 1994 MCQ

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

$K, Ca$

Mn, Fe

Co, Ni

Cr, Mn

Question 229: Palette 229/299

Errorless CPMT 1994 MCQ

The electron affinity of

Carbon is greater than oxygen

Sulphur is less than oxygen

Iodine is greater than bromine

Bromine is less than chlorine

Question 230: Palette 230/299

Errorless MP PET 1994 MCQ

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

Oxygen

Nitrogen

Chlorine

Bromine

Question 231: Palette 231/299

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

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

$O^{2-}$

$B^{3+}$

$Li^{+}$

$F^{-}$

Question 232: Palette 232/299

Errorless MP PET 1993 MCQ

Which one of the following is the biggest ion

$Al^{+3}$

$Ba^{+2}$

$Mg^{+2}$

$Na^{+}$

Question 233: Palette 233/299

Errorless MP PET 1993 MCQ

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

$N, O, F$

$P, S, Cl$

$As, Se, Br$

$Sb, Te, I$

Question 234: Palette 234/299

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

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

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

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

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

Question 235: Palette 235/299

Errorless MP PET 1993 MCQ

In the periodic table, the metallic character of elements

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

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

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

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

Question 236: Palette 236/299

Errorless KCET 1993 MCQ

Which is the weakest base

NaOH

KOH

$\mathrm{Ca(OH)_2}$

$\mathrm{Zn(OH)_2}$

Question 237: Palette 237/299

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

First group

Third group

Fifth group

First transition series

Question 238: Palette 238/299

Errorless AFMC 1992; Manipal MEE 1995 MCQ

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

Cadmium

Californium

Cerium

Cesium

Question 239: Palette 239/299

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

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

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

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

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

Question 240: Palette 240/299

Errorless CBSE PMT 1992 MCQ

Elements of which group form anions most readily

Oxygen family

Nitrogen group

Halogens

Alkali metals

Question 241: Palette 241/299

Errorless EAMCET 1992 MCQ

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

Mg atom has less number of neutrons than Al

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

Their electronegativities are different

Al has a lower ionisation potential than Mg atom

Question 242: Palette 242/299

Errorless AIIMS 1992 MCQ

Which of the following transitions involves maximum amount of energy

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

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

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

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

Question 243: Palette 243/299

Errorless KCET 1992 MCQ

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

Question 244: Palette 244/299

Errorless Bihar CEE 1992 MCQ

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

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

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

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

$ns^2 p^6 d^1$

Question 245: Palette 245/299

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

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

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

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

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

Question 246: Palette 246/299

Errorless IIT 1992 MCQ

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

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

Non-metallic elements are lesser in number than metallic elements

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

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

Question 247: Palette 247/299

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

An element of atomic number 29 belongs to

s-block

p-block

d-block

f-block

Question 248: Palette 248/299

Errorless Kurukshetra CEE 1991 MCQ

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

Lanthanum

Argon

Chromium

Aluminium

Question 249: Palette 249/299

Errorless Kurukshetra CEE 1991; KCET 2008 MCQ

An element with atomic number 21 is a

Transition element

Alkali metal

Halogen

Representative element

Question 250: Palette 250/299

Errorless AIIMS 1991 MCQ

Which has the highest second ionisation potential

Nitrogen

Carbon

Oxygen

Fluorine

Question 251: Palette 251/299

Errorless Kurukshetra CEE 1991 MCQ

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

$U > K > Cs$

$B > U > K$

$Cs > U > B$

$Cs < U < K$

Question 252: Palette 252/299

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

Which of these does not reflect the periodicity of the elements

Bonding behaviour

Electronegativity

Ionisation energy

Neutron/proton ratio

Question 253: Palette 253/299

Errorless DPMT 1990; DCE 2000 MCQ

The correct order of increasing order of oxidising power is

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

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

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

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

Question 254: Palette 254/299

Errorless Roorkee (IIT) 1990 MCQ

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

O < Se < S

Se < O < S

S < O < Se

S < Se < O

Question 255: Palette 255/299

Errorless IIT 1990 MCQ

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

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

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

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

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

Question 256: Palette 256/299

Errorless Roorkee (IIT) 1990 MCQ

The process requiring the absorption of energy is

$F\to F^{-}$

$Cl\to Cl^{-}$

$O\to O^{2 - }$

$H\rightarrow H^{-}$

Question 257: Palette 257/299

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

Mullikan's oil drop experiment

Moseley's work on $X$ -ray spectra

Bragg's work on $X$ -ray diffraction

Discovery of $X$ -rays by Rontgen

Question 258: Palette 258/299

Errorless Pb. CET 1989 MCQ

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

1.36, 1.40, 1.71

1.36, 1.71, 1.40

1.71, 1.40, 1.36

1.71, 1.36, 1.40

Question 259: Palette 259/299

Errorless EAMCET 1989 MCQ

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

Be > F > C > Ne

Be < C < F < Ne

Be > C > F > Ne

F < Ne < Be < C

Question 260: Palette 260/299

Errorless CPMT 1989; MP PET 2001 MCQ

Ionisation potential is lowest for

Halogens

Inert gases

Alkaline earth metals

Alkali metals

Question 261: Palette 261/299

Errorless IIT 1989 MCQ

Which of the following is paramagnetic

$O_2^-$

$CN^{-}$

$CO$

$NO^{+}$

Question 262: Palette 262/299

Errorless IIT 1989 MCQ

Which one of the following is strongest base

$AsH_3$

$NH_3$

$PH_3$

$SbH_3$

Question 263: Palette 263/299

Errorless IIT 1989 MCQ

Which one of the following is the smallest in size

$N^{3-}$

$O^{2-}$

$F^{-}$

$Na^{+}$

Question 264: Palette 264/299

Errorless IIT JEE 1989 MSQ

The first ionisation potential of nitrogen and oxygen atoms are related as follows

The ionisation potential of oxygen is less than the ionisation potential of nitrogen

The ionisation-potential of nitrogen is greater than the ionisation potential of oxygen

The two ionisation-potential values are comparable

The difference between the two ionisation-potential is too large

Question 265: Palette 265/299

Errorless IIT 1989 MSQ

Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because

The hydration energy of sodium sulphate is more than its lattice energy

The lattice energy of barium sulphate is more than its hydration energy

The lattice energy has no role to play in solubility

The hydration energy of sodium sulphate is less than its lattice energy

Question 266: Palette 266/299

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

Aluminium is diagonally related to (in periodic table)

Question 267: Palette 267/299

Errorless IIT 1988 MSQ

The statements that are true for the long form of the periodic table are

It reflects the sequence of filling the electrons in the order of sub-energy level s, p, d and f

It helps predict the stable valency states of the elements

It reflects trends in physical and chemical properties of the elements

It helps to predict the relative ionicity of the bond between any two elements.

Question 268: Palette 268/299

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

Which pair of elements has same chemical properties

13, 22

3, 11

4, 24

2, 4

Question 269: Palette 269/299

Errorless IIT 1987 MCQ

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

14.6, 13.6

13.6, 14.6

13.6, 13.6

14.6, 14.6

Question 270: Palette 270/299

Errorless IIT 1987 MCQ

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

0.72, 1.60

1.60, 1.60

0.72, 0.72

None of these values

Question 271: Palette 271/299

Errorless IIT 1987 MCQ

The electronegativity of the following elements increases in the order

C, N, Si, P

N, Si, C, P

Si, P, C, N

P, Si, N, C

Question 272: Palette 272/299

Errorless CPMT 1986; KCET 1998 MCQ

The long form of periodic table has

Eight horizontal rows and seven vertical columns

Seven horizontal rows and eighteen vertical columns

Seven horizontal rows and seven vertical columns

Eight horizontal rows and eight vertical columns

Question 273: Palette 273/299

Errorless CPMT 1986 MCQ

On moving from left to right across a period in the table the metallic character

Increases

Decreases

Remains constant

First increases and then decreases

Question 274: Palette 274/299

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

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

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

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

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

Question 275: Palette 275/299

Errorless MP PET 1986 MCQ

In third row of periodic table from Na to Cl

Electronegativity increases

Electronegativity decreases

Ionisation energy decreases

Atomic volume increases

Question 276: Palette 276/299

Errorless CPMT 1985; UPSEAT 2001; BHU 2003 MCQ

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

$Na - Ca$

$Na - Cl$

$Ca - Cl$

$Cl - Br$

Question 277: Palette 277/299

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

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

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

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

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

Question 278: Palette 278/299

Errorless DPMT 1984; UPSEAT 2001 MCQ

Diagonal relationship is shown by

Elements of first period

Elements of second period

Elements of third period

Both b and c

Question 279: Palette 279/299

Errorless CPMT 1983 MCQ

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

Question 280: Palette 280/299

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

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

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

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

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

Question 281: Palette 281/299

Errorless CPMT 1982, 99; Bihar CEE 2006 MCQ

Most electronegative element is

Question 282: Palette 282/299

Errorless AIIMS 1982 MCQ

Thalium shows different oxidation states because

It is a transition element

Of inert pair effect

Of its amphoteric character

Of its higher reactivity

Question 283: Palette 283/299

Errorless IIT 1982 MCQ

The element with the highest first ionization potential is

Boron

Carbon

Nitrogen

Oxygen

Question 284: Palette 284/299

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

s — block elements

p — block elements

d — block elements

Al of these

Question 285: Palette 285/299

Errorless IIT 1981 MCQ

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

C > N > O > F

O > N > F > C

O > F > N > C

F > O > N > C

Question 286: Palette 286/299

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

X = 2,8,4

Y = 2,8,8

Z = 2,8,8,1

T = 2,8,8,7

Question 287: Palette 287/299

Errorless EAMCET 1979 MCQ

Which one of the following combination represents a metallic element

2, 8, 7

2, 8, 8

2, 8, 4

2, 8, 2

Question 288: Palette 288/299

Errorless CPMT 1976; Kurukshetra CEE 1998 MCQ

The heaviest atom amongst the following is

Question 289: Palette 289/299

Errorless CPMT 1976 MCQ

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

Mendeleev

Dalton

Avogadro

Cavendish

Question 290: Palette 290/299

Errorless CPMT 1972 MCQ

Who is called the father of chemistry

Faraday

Priestley

Rutherford

Lavoiser

Question 291: Palette 291/299

Errorless MCQ

The lightest metal is

Question 292: Palette 292/299

Errorless MCQ

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

IA and IIA

IIIA and IVA

B sub groups

VA to VIIA

Question 293: Palette 293/299

Errorless MCQ

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

N and O

Na and Mg

Mg and Al

Be and B

Question 294: Palette 294/299

Errorless 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

P–iii, Q–i, R–ii, S–iv

P–iv, Q–iii, R–ii, S–i

P–ii, Q–iv, R–i, S–iii

P–i, Q–ii, R–iii, S–iv

P–iv, Q–i, R–ii, S–iii

Question 295: Palette 295/299

Errorless MCQ

Which element has the greatest tendency to loose electrons

Question 296: Palette 296/299

Errorless 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

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 297: Palette 297/299

Errorless MCQ

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

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

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

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

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

Question 298: Palette 298/299

Errorless MCQ

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

$$ M g < A l < S i < S < P $$

$$ A l < M g < S i < S < P $$

$$ M g < A l < S i < P < S $$

$$ A l < M g < S < S i < P $$

Question 299: Palette 299/299

Errorless 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) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(d) Both (A) and (R) are correct and (R) is not the correct explanation of (A)

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

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

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

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