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Chemical Bonding and Molecular Structure

Multiple Choice Questions

81.

The atomic number of Sn is 50. The shape of gaseous SnCl₂ molecule is

Cl-Sn-Cl

82.

The central carbon atom of a free radical contains

6 electrons
7 electrons
8 electrons
10 electrons

83.

Reaction for the formation of NaCl is

Na(g) + Cl₂(g) → NaCl(s)
Na(s) + $\frac{1}{2}$ Cl₂(g) → NaCl(s)
Na(g) + $\frac{1}{2}$ Cl₂(g) → NaCl(s)
Na(g) + Cl₂(g) → NaCl(g)

84.

The hybridization state of C atom in butendioic acid is

sp²
sp³
Both (a) and (b)
sp

85.
Which of the following has least bond energy?

N $_{2}^{2 -}$

N $_{2}^{-}$

N $_{2}^{+}$

N₂

N₂

i. N $_{2}^{2 -}$ - KK' σ2s², σ*2s², σ2p $_{z}^{2}$ , $π$ 2p $_{x}^{2}$ ≈ $π$ 2p $_{y}^{2}$ , $π$ *2p $_{x}^{1}$

$∴$ Bond Order = $\frac{N_{b} - N_{a}}{2}$ = $\frac{8 - 4}{2}$ = 2

ii. N $_{2}^{-}$ - KK^' σ2s², σ*2s², σ2p $_{z}^{2}$ , $π$ 2p $_{x}^{2}$ ≈ $π$ 2p $_{y}^{2}$ , $π$ *2p $_{x}^{1}$

Bond Order = $\frac{8 - 3}{2}$ = 2.5

iii. N $_{2}^{+}$ - KK' σ2s², σ*2s², σ2p $_{x}^{2}$ , $\approx π 2 p_{y}^{2}, π * 2 p_{z}^{1}$

Bond Order = $\frac{7 - 2}{2}$ = 3

iv. N₂ - KK' σ2s², σ*2s², $π 2 p_{x}^{2} \approx π 2 p_{y}^{2}, σ 2 p_{z}^{2}$

Bond Order = $\frac{8 - 2}{2}$ = 3

$∵$ Bond energy $\propto \frac{1}{Bond Order}$

Therefore, N₂ has least bond energy.

86.

Which of the following species has highest bond energy?

O $_{2}^{2 -}$
O $_{2}^{+}$
O $_{2}^{-}$
O₂

87.

Which of the following is least hydrolysed?

BeCl₂
MgCl₂
CaCl₂
BaCl₂

88.

The geometry of I $_{3}^{-}$ is

triangular
linear
tetrahedral
T-shape

89.

Which of the following species shows the maximum magnetic moment?

Mn⁶⁺
Ni²⁺
Fe³⁺
Ag⁺

90.

C-H bond length is least in

acetylene
methane
ethylene
ethane

Previous Year Papers

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Multiple Choice Questions

85. Which of the following has least bond energy? N22- N2- N2+ N2

85.
Which of the following has least bond energy?

N $_{2}^{2 -}$

N $_{2}^{-}$

N $_{2}^{+}$

N₂