On account of the disruption in education due to the corona pandemic, we're opening up our platform for teachers, free of cost. Know More →

JEE Advanced > Chemical Bonding and Molecular Structure

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

Q 1.

Correct4

Incorrect-1

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule {tex} B _ { 2 } {/tex} is

1 and diamagnetic

B

0 and diamagnetic

C

1 and paramagnetic

D

0 and paramagnetic

Explanation


Q 2.

Correct4

Incorrect-1

Among {tex} \mathrm { KO } _ { 2 } , \mathrm { AlO } _ { 2 } ^ { - } , \mathrm { BaO } _ { 2 } {/tex} and {tex} \mathrm { NO } _ { 2 } ^ { + } , {/tex} unpaired electron is present in

{tex} \mathrm { KO } _ { 2 } {/tex} only

B

{tex} \mathrm { NO } _ { 2 } ^ { + } {/tex} and {tex} \mathrm { BaO } _ { 2 } {/tex}

C

{tex} \mathrm { KO } _ { 2 } {/tex} and {tex} \mathrm { AlO } _ { 2 } ^ { - } {/tex}

D

{tex} \mathrm { BaO } _ { 2 } {/tex} only

Explanation

Q 3.

Correct4

Incorrect-1

What hybride orbitals are employed by carbon atoms {tex} 1,2 {/tex} and {tex} 3 , {/tex} respectively as labelled in the compound shown?

A

{tex} s p ^ { 3 } , s p , s p {/tex}

{tex} s p ^ { 3 } , s p ^ { 2 } , s p {/tex}

C

{tex} s p ^ { 3 } , s p , s p ^ { 2 } {/tex}

D

{tex} s p ^ { 3 } , s p ^ { 2 } , s p ^ { 2 } {/tex}

Q 4.

Correct4

Incorrect-1

Which of the following are isoelectronic and isostructural?
{tex} \mathrm { NO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } , \mathrm { ClO } _ { 3 } ^ { - } , \mathrm { SO } _ { 3 } {/tex}

{tex} \mathrm { NO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } {/tex}

B

{tex} \mathrm { SO } _ { 3 } , \mathrm { NO } _ { 3 }^{-} {/tex}

C

{tex} \mathrm { ClO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } {/tex}

D

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

Explanation

Q 5.

Correct4

Incorrect-1

When {tex} \mathrm { N } _ { 2 } ^ { + } {/tex} is formed from {tex} \mathrm { N } _ { 2 } {/tex} bond-order {tex} \ldots \ldots \ldots {/tex} and when {tex} \mathrm { O } _ { 2 } ^ { + } {/tex} is formed from {tex} \mathrm { O } _ { 2 } {/tex} bond-order {tex} \ldots . {/tex}

A

Increases

B

Decreases

C

Increases, decreases

Decreases, increases

Explanation

Q 6.

Correct4

Incorrect-1

Elements in period 3 or below don't always "obey" the octet rule because they

A

Can only use {tex} p {/tex} orbitals for bonding

B

Can use {tex} s {/tex} and {tex} p {/tex} orbitals for bonding

Can use {tex} s , p {/tex} and {tex} d {/tex} orbitals for bonding

D

Cannot use {tex} d {/tex} orbitalss for bonding

Explanation

Q 7.

Correct4

Incorrect-1

Hybridisation on carbon in carbanion is

{tex} s p ^ { 3 } {/tex}

B

{tex} s p ^ { 3 } d ^ { 2 } {/tex}

C

{tex} s p ^ { 2 } {/tex}

D

{tex} s p ^ { 3 } d {/tex}

Explanation


Q 8.

Correct4

Incorrect-1

One of the following is least volatile

A

{tex} \mathrm { HCN } {/tex}

B

{tex} \mathrm { HF } {/tex}

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { CS } _ { 2 } {/tex}

Explanation

Q 9.

Correct4

Incorrect-1

{tex} \mathrm { Mg } _ { 2 } \mathrm { C } _ { 3 } {/tex} reacts with water forming propyne. {tex} \mathrm { C } _ { 3 } ^ { 4 - } \mathrm { has } {/tex}

Two sigma and two pi bonds

B

Three sigma and one pi bonds

C

Two sigma and one pi bonds

D

Two sigma and three pi bonds

Explanation

Q 10.

Correct4

Incorrect-1

Which of the following are isoelectronic and isostructural?
{tex}\mathrm {NO_3^{-},CO_3^{2-},ClO_3^{-}, SO_3}{/tex}

{tex} \mathrm { NO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } {/tex}

B

{tex} \mathrm { SO } _ { 3 } , \mathrm { NO } _ { 3 } ^ { - } {/tex}

C

{tex} \mathrm { ClO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } {/tex}

D

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

Explanation

Q 11.

Correct4

Incorrect-1

Which of the following will have the molecular shape of a trigonalbipyramid?

{tex} \mathrm { PF } _ { 3 } \mathrm { Cl } _ { 2 } {/tex}

B

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

C

{tex}\mathrm { B r F} _ { 5 } {/tex}

D

{tex} \mathrm { SbF } _ { 2 } ^ { 2- } {/tex}

Explanation

Q 12.

Correct4

Incorrect-1

Which structure appears wrong?

B

C

D

Explanation

Q 13.

Correct4

Incorrect-1

Which are non-polar molecules?
{tex} \mathrm { I }: \mathrm { NCl } _ { 3 } ; \quad \mathrm { II }: \mathrm { SO } _ { 3 } ; \quad \mathrm { III }: \mathrm { PCl } _ { 5 } {/tex}

A

{tex} \mathrm {I} {/tex} only

B

{tex} \mathrm {II} {/tex} only

C

{tex} \mathrm {I} {/tex} and {tex} \mathrm {II} {/tex} only

{tex} \mathrm {II} {/tex} and {tex} \mathrm {III} {/tex} only

Explanation

Q 14.

Correct4

Incorrect-1

{tex} \mathrm { C } - \mathrm { H } {/tex} bond distance is the longest in

A

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 2 } {/tex}

B

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 4 } {/tex}

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

D

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 2 } \mathrm { Br } _ { 2 } {/tex}

Explanation


Q 15.

Correct4

Incorrect-1

Number of bond pairs {tex} ( X ) {/tex} and lone pairs {tex} ( Y ) {/tex} around the central atom in the {tex} \mathrm { I } _ { 3 } ^ { - } {/tex} ion are
{tex} X \quad Y {/tex}

A

{tex}2\quad\quad2{/tex}

{tex}2\quad\quad3{/tex}

C

{tex}3\quad\quad2{/tex}

D

{tex}4\quad\quad3{/tex}

Explanation