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JEE Main

Explore popular questions from Chemical Bonding and Molecular Structure for JEE Main. This collection covers Chemical Bonding and Molecular Structure previous year JEE Main questions hand picked by experienced teachers.

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Chemical Bonding and Molecular Structure

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Q 1. An element ( {tex} \mathrm { X } {/tex} ) forms compounds of the formula {tex} \mathrm { XCl } _ { 3 } , \mathrm { X } _ { 2 } \mathrm { O } _ { 5 } {/tex} and {tex} \mathrm { Ca } _ { 3 } \mathrm { X } _ { 2 } {/tex} but does not form {tex} \mathrm { XCl } _ { 5 } {/tex} . Which of the following is the element{tex}(\mathrm{X}){/tex}?

A

{tex} B {/tex}

B

{tex} Al {/tex}

{tex} N {/tex}

D

{tex} P {/tex}

Explanation

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Q 2. Which of the following anions can not be formed by boron?

{tex} \mathrm { BF } _ { 6 } ^ { 3- } {/tex}

B

{tex} \mathrm { BH } _ { 4 } ^{-} {/tex}

C

{tex} \mathrm { B } ( \mathrm { OH } ) _ { 4 } ^{-} {/tex}

D

{tex} \mathrm {B O} _ { 2 }^{-} {/tex}

Explanation

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Q 3. Which of the following would result in the formation of strongest {tex} \pi {/tex} - bond if the molecular axis is {tex} x - {/tex} axis?

A

{tex} 2 p _ { x } + 2 p _ { x } {/tex}

{tex} 2 p _ { y } + 2 p _ { y } {/tex}

C

{tex} 2 p _ { y } + 3 d _ { x y } {/tex}

D

{tex} 2 p _ { z } + 4 p _ { z } {/tex}

Explanation

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Q 4. Which of the following statement is wrong?

A

{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { dsp } ^ { 2 } {/tex} is {tex} \mathrm { d } _ { \mathrm { X } } ^ { 2 } - \mathrm { y } ^ { 2 } {/tex}

{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { sp } ^ { 3 } \mathrm { d } {/tex} is {tex} \mathrm { d } _ { \mathrm { XY } } {/tex}

C

{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { sp } ^ { 3 } \mathrm { d } ^ { 2 } {/tex} are {tex} \mathrm { d } _ { \mathrm { X } ^ { 2 } - \mathrm { Y } ^ { 2 } } {/tex} and {tex} \mathrm { d } _ { \mathrm { Z ^ {2} }} {/tex}

D

{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \operatorname { sp } ^ { 3 } \mathrm { d } ^ { 3 } {/tex} are {tex} \mathrm { d } _ { \mathrm { XY } } , \mathrm { d } _ { \mathrm { Z ^ {2}} } {/tex} and {tex} \mathrm { d } _ { \mathrm { X ^{2}} - \mathrm { Y } ^ { 2 } } {/tex}

Explanation

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Q 5. Which of the following set is not correct?

A

{tex} \mathrm { N } _ { 2 } \mathrm { O } , \mathrm { O } _ { 3 } , \mathrm { NH } _ { 4 } ^ { + } {/tex} all have co - ordinate bonds.

B

{tex} \mathrm { H } _ { 2 } \mathrm { O } , \mathrm { NO } _ { 2 } , \mathrm { ClO } _ { 2 } {/tex} all are {tex} 'V' {/tex} shape molecules.

C

{tex} \mathrm { I } _ { 3 } ^ { - } , \mathrm { ICl } _ { 2 } ^ { - } , \mathrm { NO } _ { 2 } ^ { + } {/tex} all are linear molecules.

{tex} \mathrm { SF } _ { 4 } , \mathrm { SiF } _ { 4 } , \mathrm { XeF } _ { 4 } {/tex} all are tetrahedral in shape.

Explanation

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Q 6. The incorrect order of bond dissociation energy will be :

A

{tex} \mathrm { H } - \mathrm { H } > \mathrm { Cl } - \mathrm { Cl } > \mathrm { Br } - \mathrm { Br } {/tex}

{tex} \mathrm { Si } - \mathrm { Si } > \mathrm { P } - \mathrm { P } > \mathrm { Cl } - \mathrm { Cl } {/tex}

C

{tex} \mathrm { C } - \mathrm { C } > \mathrm { N } - \mathrm { N } > \mathrm { O } - \mathrm { O } {/tex}

D

{tex} \mathrm { H } - \mathrm { Cl } > \mathrm { H } - \mathrm { Br } > \mathrm { H } - \mathrm { I } {/tex}

Explanation

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Q 7. The correct order of bond dissociation energy will be:

A

{tex} \mathrm { CO } < \mathrm { CO } _ { 2 } < \mathrm { CO } _ { 3 } ^ { 2- } \cdot ( \mathrm { C } - \mathrm { O } \text { bond } ) {/tex}

B

{tex} \mathrm { CN } ^ { - } < \mathrm { NCN } ^ { 2 - } < \mathrm { R } - \mathrm { CO } - \mathrm { NH } _ { 2 } ( \mathrm { C } - \mathrm { N } \text { bond } ) {/tex}

{tex} \mathrm { ClO } ^ { - } < \mathrm { ClO } _ { 2 } ^ { - } < \mathrm { ClO } _ { 3 } ^ { - } < \mathrm { ClO } _ { 4 } ^ { - } ( \mathrm { Cl } - \mathrm { O } \text { bond } ) {/tex}

D

{tex} \mathrm { SO } _ { 2 } < \mathrm { SO } _ { 4 } ^ { 2 - } < \mathrm { SO } _ { 3 } ^ { 2 - } ( \mathrm { S } - \mathrm { O } \text { bond } ) {/tex}

Explanation

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Q 8. In which of the following change, adjacent bond angle increases?

A

{tex} \mathrm { BeF } _ { 2 } + 2 \mathrm { F } \rightarrow \mathrm { BeF } _ { 4 } ^ { 2 - } {/tex}

B

{tex} \mathrm { SiF } _ { 4 } + 2 \mathrm { F } \rightarrow \mathrm { SiF } _ { 6 } ^ { 2 - } {/tex}

C

{tex} \mathrm { BF } _ { 3 } + \mathrm { F } \rightarrow \mathrm { BF } _ { 4 }^{-} {/tex}

{tex} \mathrm { NH } _ { 3 } + \mathrm { H } ^ { + } \rightarrow \mathrm { NH } _ { 4 } ^ { + } {/tex}

Explanation

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Q 9. In which of the following processes, the value of magnetic moment does not change?

A

{tex} \mathrm { N } _ { 2 } \rightarrow \mathrm { N } _ { 2 } ^ { - 2 } {/tex}

B

{tex} \mathrm { B } _ { 2 } \rightarrow \mathrm { B } _ { 2 } ^ { - 2 } {/tex}

{tex} \mathrm { O } _ { 2 } ^ { + } \rightarrow \mathrm { O } _ { 2 }^{-} {/tex}

D

{tex} \mathrm { O } _ { 2 } ^ { - } \rightarrow \mathrm { O } _ { 2 } ^ { - 2 } {/tex}

Explanation

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Q 10. Which of the following pair of compounds are polar, planar and {tex}sp^{2}{/tex} hybridisation?

{tex} \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } , \mathrm { SO } _ { 2 } {/tex}

B

{tex} \mathrm { HClO } _ { 2 } , \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

C

{tex} \mathrm { BFClBr } , \mathrm { ClF } _ { 3 } {/tex}

D

{tex} \mathrm { SO } _ { 3 } , \mathrm { O } _ { 3 } {/tex}

Explanation

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Q 11. In which of the following molecule {tex} 2 \mathrm { C } - 2 \mathrm { e } ^ { - } {/tex} bond is absent?

A

{tex} \mathrm { BeCl } _ { 2 } {/tex} in Vapor state

B

{tex} \mathrm { Al } _ { 2 } \mathrm { Cl } _ { 6 } {/tex}

{tex} \mathrm { BeH } _ { 2 } {/tex} in solid state

D

{tex} \mathrm { B } _ { 2 } \mathrm { H } _ { 6 } {/tex}

Explanation

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Q 12. In which of the following {tex} \mathrm { d } - {/tex} orbital's are not used by central atom in hybridization?

A

{tex} \mathrm { PF } _ { 5 } ( \mathrm { s } ) {/tex}

B

{tex} \mathrm { PCl } _ { 5 } ( \mathrm { s } ) {/tex}

{tex} \mathrm { PBr } _ { 5 } ( \mathrm { s } ) {/tex}

D

{tex} \mathrm { XeF } _ { 6 } ( \mathrm { s } ) {/tex}

Explanation



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Q 13. Which of the following compound produces only basic products on hydrolysis?

{tex} \mathrm { Mg } _ { 3 } \mathrm { N } _ { 2 } {/tex}

B

{tex} \mathrm { NCl } _ { 3 } {/tex}

C

{tex} \mathrm { BBr } _ { 3 } {/tex}

D

{tex} \mathrm { PCl } _ { 5 } {/tex}

Explanation

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Q 14. Which of the following reactions is incorrect?

{tex} \mathrm { Pb } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } \stackrel { \Delta } { \longrightarrow } \mathrm { PbO } _ { 2 } + \mathrm { NO } _ { 2 } + \mathrm { O } _ { 2 } {/tex}

B

{tex} 2 \mathrm { NaNO } _ { 3 } \stackrel { \Delta } { \longrightarrow } 2 \mathrm { NaNO } _ { 2 } + \mathrm { O } _ { 2 } {/tex}

C

{tex} \mathrm { Fe } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } \stackrel { \Delta } { \longrightarrow } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { SO } _ { 3 } {/tex}

D

{tex} 2 \mathrm { NaHCO } _ { 3 } \stackrel { \Delta } { \longrightarrow } \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { CO } _ { 2 } {/tex}

Explanation