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Chemical Bonding and Molecular Structure

Multiple Choice Questions

511.

Which is correct regarding size of atom?

N < O
B < Ne
V > Ti
Na > K

512.

Which of the following is not sp² hybridised?

Graphite
Graphene
Fullerene
Dry ice

513.

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

Ti²⁺,3.87 B.M.
Cr²⁺, 4.90 B.M.
Co³⁺,3.87 B.M.
Mn²⁺,4.90 B.M.

514.

In O₃molecule, the formal charge on the central O-atom is

0
-1
-2
+1

515.
Which of the following represents the correct bond order?

$O_{2}^{+} < O_{2}^{-} > O_{2}^{2 -}$

$O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+}$

$O_{2}^{2 -} > O_{2}^{+} > O_{2}^{-}$

$O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -}$

$O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -}$

Hence, the coorect Bond order is $O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -}$

Ion
Total no of electron
MO configuration Bond order

$o_{2}^{+}$ 15 ${KK σ2s}^{2} σ^{*} 2 s^{2} σ 2 p_{x}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{*} 2 p_{x}^{1} = π^{*} 2 p_{y}^{0}$ 2.5

$o_{2}^{-}$ 17 ${KK α2s}^{2} σ^{*} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{*} 2 p_{x}^{2} = π^{*} 2 p_{y}^{1}$ 1.5

$o_{2}^{2 -}$ 18 ${KKσ2s}^{2} σ^{*} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{*} 2 p_{x}^{2} = π^{*} 2 p_{y}^{2}$ 1.0

516.

What is the oxidation number of Br in KBrO₄?

517.

Which ofthe following statements is incorrect?

Li⁺ has minimum degree of hydration.
The oxidation state of K in KO₂ is + 1.
Na is used to make a Na/Pb alloy.
MgSO₄ is readily soluble in water.

518.

Assertion: Co(IV) is known but Ni(IV) is not.

Reason: Ni(IV) has d4 electronic configuration.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

519.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason: The bond length of N₂ is shorter than that of oxygen.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

520.

Assertion : O₂has higher bond length than O₃.

Reason: O₃is paramagnetic.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

Ion	Total no of electron	MO configuration	Bond order
$o_{2}^{+}$	15	${KK σ2s}^{2} σ^{} 2 s^{2} σ 2 p_{x}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{} 2 p_{x}^{1} = π^{*} 2 p_{y}^{0}$	2.5
$o_{2}^{-}$	17	${KK α2s}^{2} σ^{} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{} 2 p_{x}^{2} = π^{*} 2 p_{y}^{1}$	1.5
$o_{2}^{2 -}$	18	${KKσ2s}^{2} σ^{} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{} 2 p_{x}^{2} = π^{*} 2 p_{y}^{2}$	1.0

Previous Year Papers

Test Series

Test Yourself

Multiple Choice Questions

515. Which of the following represents the correct bond order? O2+<O2->O22- O2->O22->O2+ O22->O2+>O2- O2+>O2->O22-

515.
Which of the following represents the correct bond order?

$O_{2}^{+} < O_{2}^{-} > O_{2}^{2 -}$

$O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+}$

$O_{2}^{2 -} > O_{2}^{+} > O_{2}^{-}$

$O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -}$