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Year: 2024
Topic: Chemical Bonding and Molecular Structure
1.
The \(\text{E}^\circ\) value for the \(\text{Mn}^{3+}\,/\,\text{Mn}^{2+}\) couple is more positive than that of \(\text{Cr}^{3+}\,/\,\text{Cr}^{2+}\) or \(\text{Fe}^{3+}\,/\,\text{Fe}^{2+}\) due to change of:
(1).
\(d^4\) to \(d^5\) configuration
(2).
\(d^3\) to \(d^5\) configuration
(3).
\(d^5\) to \(d^4\) configuration
(4).
\(d^5\) to \(d^2\) configuration

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Year: 2021
Topic: Chemical Bonding and Molecular Structure
2.
Match List -I with List - II.

Choose the correct answer from the options given below.
(1).
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
(2).
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(3).
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
(4).
(a)-(iv), (b)-(iii), (c)-(i), (d)-(i)

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Year: 2021
Topic: Chemical Bonding and Molecular Structure
3.
Which of the following molecules is non-polar in nature?
(1).
POCl3
(2).
CH2O
(3).
SbCl5
(4).
NO2

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Solution
Year: 2019
Topic: Chemical Bonding and Molecular Structure
4.
The number of sigma (\(\sigma\)) and pi (\(\pi\)) bonds in pent-2 en-4-yne is
(1).
8 \(\sigma\) bonds and 5 \(\pi\) bonds
(2).
11 \(\sigma\) bonds and 2 \(\pi\) bonds
(3).
13 \(\sigma\) bonds and no \(\pi\) bonds
(4).
10 \(\sigma\) bonds and 3 \(\pi\) bonds

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Solution
Year: 2018
Topic: Chemical Bonding and Molecular Structure
5.
In the structure of ClF3, the number of lone pair of electrons on central atom ‘Cl’ is
(1).
Three
(2).
Four
(3).
Two
(4).
One

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Solution
Year: 2018
Topic: Chemical Bonding and Molecular Structure
6.
Which of the following molecules represents the order of hybridization sp2, sp2, sp, sp from left to right atoms ?
(1).
CH3 – CH = CH – CH3
(2).
CH2 = CH – CH = CH2
(3).
CH2 = CH – C ≡ CH
(4).
HC ≡ C – C ≡ CH

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Solution
Year: 2017
Topic: Chemical Bonding and Molecular Structure
7.
Match the interhalogen compounds of column I with the geometry in column II and assign the correct code.
(1).
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
(2).
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
(3).
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)
(4).
(a) - (v), (b) - (iv), (c) - (iii), (d) - (ii)

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Year: 2017
Topic: Chemical Bonding and Molecular Structure
8.
Which one of the following pairs of species have the same bond order ?
(1).
N2, O2–
(2).
CO, NO
(3).
O2, NO+
(4).
CN-, CO

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Year: 2025
Topic: Chemical Bonding and Molecular Structure
9.
Given below are two statements :
Statement I : A hypothetical diatomic molecule with bond order zero is quite stable.
Statement II : As bond order increases, the bond length increases.
In the light of the above statements, choose the most appropriate answer from the options given below :
(1).
Statement I is false but Statement II is true
(2).
Both Statement I and Statement II are true
(3).
Both Statement I and Statement II are false
(4).
Statement I is true but Statement II is false

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Year: 2025
Topic: Chemical Bonding and Molecular Structure
10.
Among the given compounds I - III, the correct order of bond dissociation energy of C-H bond marked with * is :
(1).
II > III > I
(2).
II > I > III
(3).
I > II > III
(4).
III > II > I

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Solution
Year: 2025
Topic: Chemical Bonding and Molecular Structure
11.
Identify the correct orders against the property mentioned
A.\(H_2O\, >\, NH_3 \,> \,CHCI_3\) - dipole moment
B. \(XeF_4\, >\, XeO_3\, >\, XeF_2\) - number of lone pairs on central atom
C. \(O-H \,>\, C-H \,>\, N-O \) - bond length
D. \(N_2 \,>\, O_2 \,>\, H_2\) - bond enthalpy
Choose the correct answer fromthe options given below:
(1).
B, C only
(2).
A, D only
(3).
B, D only
(4).
A, C only

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Year: 2024
Topic: Chemical Bonding and Molecular Structure
12.
Identify the correct answer
(1).
Dipole moment of \(\text{NF}_3\) is greater than that of \(\text{NH}_3\)
(2).
Three canonical forms can be drawn from \(\text{CO}^{2-}_3\) ion
(3).
Three resonace structures can be drawn for ozone
(4).
\(\text{BF}_3\) has non-zero dipole moment

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Solution
Year: 2024
Topic: Chemical Bonding and Molecular Structure
13.
Arrange the following elements in increasing order of first ionization enthalpy:
Li, Be, B, N
Choose the correct answer from the options given below:
(1).
Li < Be < C < B < N
(2).
Li < Be < N < B < C
(3).
Li < Be < B < C < N
(4).
Li < B < Be < C < N

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Solution
Year: 2024
Topic: Chemical Bonding and Molecular Structure
14.
Match List-I with List-II:

Choose the correct answer from the options given below:
(1).
A-III, B-IV, C-II, D-I
(2).
A-III, B-IV, C-I, D-II
(3).
A-I, B-IV, C-II, D-III
(4).
A-IV, B-II, C-II, D-I

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Solution
Year: 2023
Topic: Chemical Bonding and Molecular Structure
15.
Amongst the following, the total number of species NƠT having eight electrons around central atom in its outer most shell, is NH3, AICI3, BeCl2, CCl4, PCI 5 :
(1).
2
(2).
4
(3).
1
(4).
3

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Solution
Year: 2023
Topic: Chemical Bonding and Molecular Structure
16.
The correct order of energies of molecular orbitals of N2 molecule, is
(1).
(2).
(3).
(4).

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Solution
Year: 2023
Topic: Chemical Bonding and Molecular Structure
17.
The number of \(\sigma\) bonds, \(\pi\) bonds and lone pair of electrons in pyridine, respectively are:
(1).
12, 3,0
(2).
11, 3, 1
(3).
12, 2, 1
(4).
11, 2, 0

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Solution
Year: 2023
Topic: Chemical Bonding and Molecular Structure
18.
The stability of Cu is more than Cu+ salts in aqueous solution due to
(1).
enthalpy of atomization.
(2).
hydration energy.
(3).
second ionisation enthalpy.
(4).
first ionisation enthalpy.

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Year: 2022
Topic: Chemical Bonding and Molecular Structure
19.
Which amongst the following is incorrect statement?
(1).
The bond order of \(O_{2}^{+}\), \(O_2\), \(O_{2}^{-}\), and \(O_{2}^{2-}\) are2.5, 2, 1.5 and 1, respectively
(2).
\(C_2\) molecule has four electrons in its two degenerate molecular orbitals
(3).
\(H_{2}^{+}\) ion has one electron
(4).
\(O_{2}^{+}\) ion is diamagnetic dry

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Solution
Year: 2022
Topic: Chemical Bonding and Molecular Structure
20.
Amongst the following which one will havemaximum 'lone pair - lone pair' electron repulsions?
(1).
CIF3
(2).
IF5
(3).
SF4
(4).
XeF2

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Solution
Year: 2021
Topic: Chemical Bonding and Molecular Structure
21.
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are:
(1).
sp3 and 4
(2).
sp3 and 6
(3).
sp2 and 6
(4).
sp2 and 8

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Solution
Year: 2021
Topic: Chemical Bonding and Molecular Structure
22.
The structures of beryllium chloride in solid state and vapour phase, are:
(1).
Chain and dimer, respectively
(2).
Linear in both
(3).
Dimer and Linear, respectively
(4).
Chain in both

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Solution
Year: 2021
Topic: Chemical Bonding and Molecular Structure
23.
From the following pairs of ions which one is not an iso-electronic pair?
(1).
O2-,F-
(2).
Na+,Mg2+
(3).
Mn2+,Fe3+
(4).
Fe2+,Mn2+

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Solution
Year: 2020
Topic: Chemical Bonding and Molecular Structure
24.
Which of the following set of molecules will have zero dipole moment?
(1).
Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
(2).
Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
(3).
Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene bn
(4).
Ammonia, berylium difluoride, water, 1,4- dichlorobenzene

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Solution
Year: 2020
Topic: Chemical Bonding and Molecular Structure
25.
Identify a molecule which does not exist.
(1).
Li2
(2).
C2
(3).
O2
(4).
He2

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Solution
Year: 2019
Topic: Chemical Bonding and Molecular Structure
26.
Identify the incorrect statement related to PCl5 from the following
(1).
Two axial P—Cl bonds make an angle of 180° with each other.
(2).
Axial P—Cl bonds are longer than equatorial P—Cl bonds.
(3).
PCl5 molecule is non-reactive.
(4).
Three equatorial P—Cl bonds make an angle of 120° with each other.

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Solution
Year: 2018
Topic: Chemical Bonding and Molecular Structure
27.
Consider the following species:
CN+, CN–, NO and CN
Which one of these will have the highest bond order ?
(1).
CN
(2).
CN+
(3).
CN–
(4).
NO

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Solution
Year: 2018
Topic: Chemical Bonding and Molecular Structure
28.
The bond disssociation energies of X2, Y2 and XY are in the ratio 1 : 0.5 : 1. \(\Delta\)H for the formation of XY is -200 KJ mol-. The bond dissociation energy of X2 will be
(1).
400 kJ mol–1
(2).
800 kJ mol–1
(3).
100 kJ mol–1
(4).
200 kJ mol–1

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Solution
Year: 2017
Topic: Chemical Bonding and Molecular Structure
29.
Which of the following pair of compounds is isoelectronic and isostructural ?
(1).
IF3 , XeF2
(2).
BeCl2, XeF2
(3).
Tel2, XeF2
(4).
IBr2- , XeF2

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Solution
Year: 2017
Topic: Chemical Bonding and Molecular Structure
30.
With respect to the conformers of ethane, which of the following statements is true ?
(1).
Both bond angles and bond length remains same.
(2).
Bond angle remains same but bond length changes.
(3).
Bond angle changes but bond length remains same.
(4).
Both bond angle and bond length change.

Test
Solution
Year: 2017
Topic: Chemical Bonding and Molecular Structure
31.
The species, having bond angles of 120° is
(1).
BCl3
(2).
PH3
(3).
ClF3
(4).
NCl3

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Solution
Year: 2016
Topic: Chemical Bonding and Molecular Structure
32.
The pair of electron in the given carbanion, CH3C≡C–, is present in which orbitals ?
(1).
sp3
(2).
sp2
(3).
sp
(4).
2p

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Year: 2016
Topic: Chemical Bonding and Molecular Structure
33.
Consider the molecules CH4, NH3 and H2O. Which of the given statements is false ?
(1).
The H–O–H bond angle in H2O is larger than the H–C–H bond angle in CH4
(2).
the The H–O–H bond angle in H2O is smaller than H–N–H bond angle in NH3
(3).
The H–C–H bond angle in CH4 is larger than the H–N–H bond angle in NH3
(4).
The H–C–H bond angle in CH4, the H-N-H bond angle in NH3 and the H-O-H bond angle in H2O are all greater than 90°

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Year: 2016
Topic: Chemical Bonding and Molecular Structure
34.
Predict the correct order among the following .
(1).
lone pair - lone pair > bond pair - bond pair > lone pair - bond pair
(2).
bond pair - bond pair > lone pair - bond pair > lone pair - lone pair
(3).
lone pair - bond pair > bond pair - bond pair > lone pair - lone pair
(4).
lone pair - lone pair > lone pair - bond pair > bond pair - bond pair

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