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Chemical Bonding and Molecular Structure

Multiple Choice Questions

81.

Geometry of ${SiO}_{4}^{4 -}$ anion is

tetrahedral
trigonal
trihedral
pentagonal

82.

Chlorine (Cl¹⁷) free radical contains how many electrons around the nucleus?

83.

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

Cl-Sn-Cl

84.

The central carbon atom of a free radical contains

6 electrons
7 electrons
8 electrons
10 electrons

85.

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)

86.

The hybridization state of C atom in butendioic acid is

sp²
sp³
Both (a) and (b)
sp

87.

Which of the following has least bond energy?

N $_{2}^{2 -}$
N $_{2}^{-}$
N $_{2}^{+}$
N₂

88.
Which of the following species has highest bond energy?

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

O $_{2}^{+}$

O $_{2}^{-}$

O₂

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

i. O $_{2}^{2 -}$ = KK' σ2s², σ*2s², σ2p $_{z}^{2}$ , $π 2 p_{x}^{2}, π 2 p_{y}^{2}, π * 2 p_{x}^{2}, π * 2 p_{y}^{2}$

Bond Order = $\frac{N_{b} - N_{a}}{2}$ = $\frac{8 - 6}{2}$ = 1

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

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

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

Bond Order = $\frac{8 - 5}{2}$ = 1.5

iv. O₂ = KK' σ2s², σ*2s², σ2p $_{z}^{2}$ , $π 2 p_{x}^{2} \approx π 2 p_{y}^{2} π * 2 p_{x}^{1} \approx π * 2 p_{y}^{1}$

Bond Order = $\frac{8 - 4}{2}$ = 2

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

Therefore, O $_{2}^{2 -}$ has highest bond energy.

89.

Which of the following is least hydrolysed?

BeCl₂
MgCl₂
CaCl₂
BaCl₂

90.

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

triangular
linear
tetrahedral
T-shape

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Multiple Choice Questions

88. Which of the following species has highest bond energy? O22- O2+ O2- O2

88.
Which of the following species has highest bond energy?

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

O $_{2}^{+}$

O $_{2}^{-}$

O₂