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Chemical Bonding and Molecular Structure

Multiple Choice Questions

101.

Which of the following pair have identical bond order?

CN^- and NO⁺
CN^- and O $_{2}^{-}$
CN^- and CN⁺
NO⁺ and O $_{2}^{-}$

102.

Hybridisation of carbon is CH $_{3}^{-}$

sp²
sp³
sp³d
sp³d²

103.

The common features among CO, CN^- and NO $_{2}^{+}$ are

Bond order three and isoelectronic.
Bond order three and weak field ligands.
Bond order two and $π$ -acceptors.
Bond order three and $π$ -donors.

104.

Identify the T-shaped molecule from the following.

BF₃
NH₃
NF₃
CIF₃

105.

Which one of the following molecules has the least dipole moment?

H₂O
BeF₂
NH₃
NF₃

106.

Dipole-dipole interaction energy between polar molecules in solids depends on the radius of the molecule (r) and it is directly proportional to

(1/r³)
(1/r⁶)
(1/r)
(1/r⁵)

107.
Which of the following changes in the respective bond order values are caused by removal of an electron from N₂ and F₂ molecules?

Decrease by 0.5 in both

Increase by 0.5 in both

Increase by 0.5 in the former and decrease by 0.5 in the latter

Decrease by 0.5 in the former and increase by 0.5 in the latter

Decrease by 0.5 in the former and increase by 0.5 in the latter

Electronic configuration of N₂ (total electrons = 14)

σ1s², σ*1s², σ2s², σ*2s², $π 2 p_{x}^{2} \approx π 2 p_{y}^{2}$ , σ2p $_{z}^{2}$

Electronic configuration of F₂ (total electrons = 18)

σ1s², σ*1s², σ2s², σ*2s², σ2p $_{z}^{2}$ , $π 2 p_{x}^{2} \approx π 2 p_{y}^{2}, π * 2 p_{x}^{2} \approx π * 2 p_{y}^{2}$

For N₂, the valence orbital is bonding molecular orbital and for F₂, it is antibonding molecular orbital. So, bond order decrease by 0.5 in the former and increase by 0.5 in the latter.

108.

The hybridised state of bromine in bromine pentafluoride is

sp³d
dsp³
d²sp³
sp³d²

109.

The correct ascending order of ligand field strength of the given ligands is

F^- < I^- < CN^- < H₂O < CO
I^- < F^- < H₂O < CO < CN^-
I^- < F^- < H₂O < CN^- < CO
F^- < H₂O < I^- < CN^- < CO

110.

Arrange the following species in the correct order of their stability

C₂, Li₂, O $_{2}^{+}$ , He $_{2}^{+}$

Li₂ < He $_{2}^{+}$ < O $_{2}^{+}$ < C₂
C₂ < O $_{2}^{+}$ < Li₂ < He $_{2}^{+}$
He $_{2}^{+}$ < Li₂ < C₂ < O $_{2}^{+}$
O $_{2}^{+}$ < C₂ < Li₂ < He $_{2}^{+}$