Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

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

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.

88.

Which of the following species has highest bond energy?

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

89.

Which of the following is least hydrolysed?

BeCl₂
MgCl₂
CaCl₂
BaCl₂

90.

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

triangular
linear
tetrahedral
T-shape

Previous Year Papers

Test Series

Test Yourself

Multiple Choice Questions

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

87.
Which of the following has least bond energy?

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

N $_{2}^{-}$

N $_{2}^{+}$

N₂