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Classification of Elements and Periodicity in Properties

173 Questions Start Allen Test
All Exams Errorless Allen
Q126 Allen 7. PYQ MCQ
Which of the following orders of ionic radii is correctly represented?
A.
$H^{-} > H^{+} > H$
B.
$Na^{+} < F^{-} < O^{2-}$
C.
$F^{-} > O^{2-} > Na^{+}$
D.
$Al^{3+} > Mg^{2+} > N^{3-}$
Q127 Allen 7. PYQ MCQ
$\mathrm{Be}^{2+}$ is isoelectronic with which of the following ions?
A.
$\mathrm{H}^{+}$
B.
$\mathrm{Li}^{+}$
C.
$\mathrm{Na}^{+}$
D.
$\mathrm{Mg}^{2+}$
Q128 Allen 7. PYQ MCQ
Acidity of diprotic acids in aqueous solutions increases in the order :-
A.
$\mathrm{H}_2\mathrm{S} < \mathrm{H}_2\mathrm{Se} < \mathrm{H}_2\mathrm{Te}$
B.
$\mathrm{H}_2\mathrm{Se} < \mathrm{H}_2\mathrm{S} < \mathrm{H}_2\mathrm{Te}$
C.
$\mathrm{H}_2\mathrm{Te} < \mathrm{H}_2\mathrm{S} < \mathrm{H}_2\mathrm{Se}$
D.
$\mathrm{H}_2\mathrm{Se} < \mathrm{H}_2\mathrm{Te} < \mathrm{H}_2\mathrm{S}$
Q129 Allen 7. PYQ MCQ
Reason of lanthanoid contraction is :-
A.
Negligible screening effect of 'f' orbitals
B.
Increasing nuclear charge
C.
Decreasing nuclear charge
D.
Decreasing screening effect
Q130 Allen 7. PYQ MCQ
The species Ar, $K^{+}$ and $Ca^{2+}$ contain the same number of electrons. In which order do their radii increase?
A.
$Ca^{2+} < Ar < K^{+}$
B.
$Ca^{2+} < K^{+} < Ar$
C.
$K^{+} < Ar < Ca^{2+}$
D.
$Ar < K^{+} < Ca^{2+}$
Q131 Allen 7. PYQ 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)
Q132 Allen 7. PYQ MCQ
Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the brackets are atomic numbers).
A.
Zr (40) and Nb (41)
B.
Zr (40) and Hf (72)
C.
Zr (40) and Ta (73)
D.
Ti (22) and Zr (40)
Q133 Allen 7. PYQ MCQ
The formation of the oxide ion, $O^{2-}$ (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below: $O(g) + e^{-} \rightarrow O_{(g)}^{-}$ ; $\Delta fH^{-} = -141 \, kJ mol^{-1}$ $O^{-}(g) + e^{-} \rightarrow O_{(g)}^{2-}$ ; $\Delta fH^{-} = +780 \, kJ mol^{-1}$ Thus process of formation of $O^{2-}$ in gas phase is unfavourable even thought $O^{2-}$ is isoelectronic with neon. It is due to the fact that,
A.
Oxygen is more electronegative
B.
Addition of electron in oxygen results in larger size of the ion
C.
Electron repulsion outweighs the stability gained by achieving noble gas configuration
D.
O-ion has comparatively smaller size than oxygen atom
Q134 Allen 7. PYQ MCQ
Which is the correct order of increasing energy of the Columned orbitals in the atom of titanium? (At. no. Z = 22)
A.
3s 3p 3d 4s
B.
3s 3p 4s 3d
C.
3s 4s 3p 3d
D.
4s 3s 3p 3d
Q135 Allen 7. PYQ MSQ
In which of the following options the order of arrangement does not agree with the variation of 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 < Cl < F (increasing electron gain enthalpy)
D.
Li < Na < K < Rb (increasing metallic radius)
Q136 Allen 7. PYQ MCQ
The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?
A.
Carbon family, [Rn] $5f^{14}$ $6d^{10}$ $7s^{2}$ $7p^{2}$
B.
Oxygen family, [Rn] $5f^{14}$ $6d^{10}$ $7s^{2}$ $7p^{4}$
C.
Nitrogen family, [Rn] $5f^{14}$ $6d^{10}$ $7s^{2}$ $7p^{6}$
D.
Halogen family, [Rn] $5f^{14}$ $6d^{10}$ $7s^{2}$ $7p^{5}$
Q137 Allen 7. PYQ MCQ
Which of the following oxides is most acidic in nature?
A.
MgO
B.
BeO
C.
BaO
D.
CaO
Q138 Allen 7. PYQ 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
Q139 Allen 7. PYQ MCQ
Which of the following is an amphoteric hydroxide?
A.
$Sr(OH)_2$
B.
$Ca(OH)_2$
C.
$Mg(OH)_2$
D.
$Be(OH)_2$
Q140 Allen 7. PYQ 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
Q141 Allen 7. PYQ MCQ
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :-
A.
$5\mathrm{f} > 6\mathrm{p} > 5\mathrm{p} > 4\mathrm{d}$
B.
$6\mathrm{p} > 5\mathrm{f} > 5\mathrm{p} > 4\mathrm{d}$
C.
$6\mathrm{p} > 5\mathrm{f} > 4\mathrm{d} > 5\mathrm{p}$
D.
$5\mathrm{f} > 6\mathrm{p} > 4\mathrm{d} > 5\mathrm{p}$
Q142 Allen 7. PYQ MCQ
Match the oxide given in column A with its property given in column B:
Which of the following options has all correct pairs? Match the Column-I
Column-II:
Column-IColumn-II
(A)$Na_{2}O$
(B)$Al_{2}O_{3}$
(C)$N_{2}O$
(D)$Cl_{2}O_{7}$
(P)Neutral
(Q)Basic
(R)Acidic
(S)Amphoteric
A.
A-Q, B-P, C-S, D-R
B.
A-R, B-Q, C-P, D-S
C.
A-P, B-S, C-Q, D-R
D.
A-Q, B-S, C-P, D-R
Q143 Allen 7. PYQ Match the Columns
Identify the incorrect match:
(Name), (IUPAC Official Name)
Column-IColumn-II
(A)Unnilunium
(B)Unniltrium
(C)Unnilhexium
(D)Unununnium
(I)Mendelevium
(II)Lawrencium
(III)Seaborgium
(IV)Darmstadtium
A.
(d), (iv)
B.
(a), (i)
C.
(b), (ii)
D.
(c), (iii)
Q144 Allen 7. PYQ MCQ
Match the following:
Column-I (Oxide), Column-II (Nature)
Which of the following is correct option?
Column-IColumn-II
(A)CO
(B)BaO
(C)$Al_{2}O_{3}$
(D)$Cl_{2}O_{7}$
(P)Basic
(Q)Neutral
(R)Acidic
(S)Amphoteric
A.
A-S, B-R, C-Q, D-P
B.
A-P, B-Q, C-R, D-S
C.
A-Q, B-P, C-S, D-R
D.
A-R, B-S, C-P, D-Q
Q145 Allen 7. PYQ MCQ
Match the element in Column-I with Column-II. Identify the correct match :
Column-IColumn-II
(A)Copper
(B)Fluorine
(C)Silicon
(D)Cerium
(P)Non-metal
(Q)Transition metal
(R)Lanthanoid
(S)Metalloid
A.
A-Q, B-S, C-P, D-R
B.
A-Q, B-P, C-S, D-R
C.
A-S, B-R, C-P, D-Q
D.
A-P, B-Q, C-R, D-S
Q146 Allen 7. PYQ MCQ
Which of the following oxide is amphoteric in nature?
A.
$SnO_{2}$
B.
$SiO_{2}$
C.
$GeO_{2}$
D.
$CO_{2}$
Q147 Allen 7. PYQ MCQ
Statement-I : Acid strength increases in the order given as HF << HCl << HBr << HI. Statement-II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.
A.
Both Statement-I and Statement-II are true.
B.
Both Statement-I and Statement-II are false.
C.
Statement-I is correct but Statement-II is false.
D.
Statement-I is incorrect but Statement-II is true.
Q148 Allen 7. PYQ MCQ
Zr (Z =40) and Hf (Z =72) have similar atomic and ionic radii because of:
A.
belonging to same group
B.
diagonal relationship
C.
lanthanoid contraction
D.
having similar chemical properties
Q149 Allen 7. PYQ MCQ
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
A.
HF < HCl < HBr < HI :Increasing acidic strength
B.
$H_{2}O < H_{2}S < H_{2}Se < H_{2}Te$ :Increasing pK $_{a}$ values
C.
$NH_{3} < PH_{3} < AsH_{3} < SbH_{3}$ :Increasing acidic character
D.
$CO_{2} < SiO_{2} < SnO_{2} < PbO_{2}$ :Increasing oxidizing power
Q150 Allen 7. PYQ MCQ
The IUPAC name of an element with atomic number 119 is
A.
unnilennium
B.
unununnium
C.
ununoctium
D.
ununennium