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Chemical Bonding and Molecular Structure

Multiple Choice Questions

61.

The sp³d² hybridisation of central atom of a molecule would lead to

square planar geometry
tetrahedral geometry
trigonal bipyramidal geometry
octahedral geometry

62.

Hybridisation of C₂ and C₃ of H₃C-CH=C-CH₃ are

sp, sp³
sp², sp
sp², sp²
sp, sp

63.

Nitrogen forms stable N₂ molecule, but phosphorus is converted to P₄ from P₂ because

$pπ - pπ$ bonding is strong in phosphorus
$pπ - pπ$ bonding is weak in phosphorus
double bond is present in phosphorus
single P-P bond is weaker than N-N bond

64.

Which of the following ion is diamagnetic?

Nd³⁺
La³⁺
Tb³⁺
Er³⁺

65.

An aqueous solution of titanium chloride, when subjected to magnetic measurement, show zero magnetic moment. The formula of complex in aqueous solution is

[Ti(H₂O)₆]Cl₄
[Ti(H₂O)₆]Cl₃
[Ti(H₂O)₅Cl]Cl₂
[Ti(H₂O)₆]Cl

66.

Among [Fe(H₂O)₆]⁺, [Fe(CN)₆]^3-, [Fe(Cl)₆]^3- species, the hybridisation state of the Fe atom are, respectively.

d²sp³, d²sp³, sp³d²
sp³d²,d²sp³, d²sp³
sp³d², d²sp³,sp³d²
None of the above

67.

Which of the following ligands is tetradentate?

68.

Some of the properties of the two species, ${NO}_{3}^{-} and H_{3} O^{+}$ are described below. Which one of them is correct?

Dissimilar in hybridisation for the central atom with different structures
Isostructural with same hybridisation for the central atom
Isostructural with different hybridisation for the central atom
Similar in hybridisation for the central atom with different structures

69.

Which of the following structures is the most preferred and hence of lowest energy for SO₃?

70.
The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

$O_{2}^{-}, O_{2}^{2 -}$ - Both diamagnetic

$O^{+}, O_{2}^{2 -}$ - Both diamagnetic

$O_{2}^{+}, O_{2}$ - Both diamagnetic

$O, O_{2}^{2 -}$ - Both diamagnetic

$O_{2}^{+}, O_{2}$ - Both diamagnetic

$The molecular orbital configuration of O_{2}^{+}, O_{2}^{-}, O_{2}^{2 -} and O_{2} are O_{2}^{+} = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2} \approx \overset{*}{π} 2 p_{y}^{2}, π 2 p_{x}^{1}, \overset{*}{π} 2 p_{y}^{0} O_{2}^{-} = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2} \approx \overset{*}{π} 2 p_{y}^{2}, π 2 p_{x}^{2}, \overset{*}{π} 2 p_{y}^{1} O_{2}^{2 -} = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2} \approx \overset{*}{π} 2 p_{y}^{2}, π 2 p_{x}^{2}, \overset{*}{π} 2 p_{y}^{2} O_{2} = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2} \approx \overset{*}{π} 2 p_{y}^{2}, π 2 p_{x}^{1}, \overset{*}{π} 2 p_{y}^{1}$

and the electronic configuration of O and O⁺ are

$O = 1 s^{2}, 2 s^{2}, 2 p_{x}^{2}, 2 p_{y}^{1}, 2 p_{z}^{1} O^{+} = 1 s^{2}, 2 s^{2}, 2 p_{x}^{1}, 2 p_{y}^{1}, 2 p_{z}^{1} As O_{2}^{+}, O_{2}, O_{2}^{-}, O and O^{+} have unpaired electrons, hence are paramagnetic .$

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Multiple Choice Questions

70. The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description? O2-, O22- - Both diamagnetic O+, O22- - Both diamagnetic O2+, O2 - Both diamagnetic O, O22- - Both diamagnetic