JEE Main > Chemical Bonding and Molecular Structure

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 popular teachers.


Q 1.    

Correct4

Incorrect-1

In which of the following species the interatomic bond angle is {tex} 109 ^ { \circ } 28 ^ { \text {' } } {/tex} ?

{tex} \mathrm { NH } _ { 3 } , \left( \mathrm { BF } _ { 4 } \right) ^ { - 1 } {/tex}

B

{tex} \left( \mathrm { NH } _ { 4 } \right) ^ { + } , \mathrm { BF } _ { 3 } {/tex}

C

{tex} \mathrm { NH } _ { 3 } , \mathrm { BF } _ { 4 } {/tex}

D

{tex} \left( \mathrm { NH } _ { 2 } \right) ^ { - 1 } , \mathrm { BF } _ { 3 } {/tex}

Explanation

Q 2.    

Correct4

Incorrect-1

An ether is more volatile than an alcohol having the same molecular formula. This is due to

A

alcohols having resonance structures

B

inter-molecular hydrogen bonding in ethers

inter-molecular hydrogen bonding in alcohols

D

dipolar character of ethers

Explanation

Q 3.    

Correct4

Incorrect-1

Which one of the following pairs of molecules will have permanent dipole moments for both members?

A

{tex} \mathrm { NO } _ { 2 } {/tex} and {tex} \mathrm { CO } _ { 2 } {/tex}

{tex} \mathrm { NO } _ { 2 } {/tex} and {tex} \mathrm { O } _ { 3 } {/tex}

C

{tex} \mathrm { SiF } _ { 4 } {/tex} and {tex} \mathrm { CO } _ { 2 } {/tex}

D

{tex} \mathrm { SiF } _ { 4 } {/tex} and {tex} \mathrm { NO } _ { 2 } {/tex}

Explanation

Q 4.    

Correct4

Incorrect-1

Which one of the following compounds has the smallest bond angle in its molecule?

A

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

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

C

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

D

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

Explanation

Q 5.    

Correct4

Incorrect-1

The pair of species having identical shapes for molecules of both species is

{tex} \mathrm { XeF } _ { 2 } , \mathrm { CO } _ { 2 } {/tex}

B

{tex} \mathrm { BF } _ { 3 } , \mathrm { PCl } _ { 3 } {/tex}

C

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

D

{tex} \mathrm { CF } _ { 4 } , \mathrm { SF } _ { 4 } {/tex}

Explanation

Q 6.    

Correct4

Incorrect-1

The correct order of bond angles (smallest first) in {tex} \mathrm { H } _ { 2 } \mathrm { S } {/tex} , {tex} \mathrm { NH } _ { 3 } , \mathrm { BF } _ { 3 } {/tex} and {tex} \mathrm { SiH } _ { 4 } {/tex} is

{tex} \mathrm { H } _ { 2 } \mathrm { S } < \mathrm { NH } _ { 3 } < \mathrm { SiH } _ { 4 } < \mathrm { BF } _ { 3 } {/tex}

B

{tex} \mathrm { NH } _ { 3 } < \mathrm { H } _ { 2 } \mathrm { S } < \mathrm { SiH } _ { 4 } < \mathrm { BF } _ { 3 } {/tex}

C

{tex} \mathrm { H } _ { 2 } \mathrm { S } < \mathrm { SiH } _ { 4 } < \mathrm { NH } _ { 3 } < \mathrm { BF } _ { 3 } {/tex}

D

{tex} \mathrm { H } _ { 2 } \mathrm { S } < \mathrm { NH } _ { 3 } < \mathrm { BF } _ { 3 } < \mathrm { SiH } _ { 4 } {/tex}

Explanation

Q 7.    

Correct4

Incorrect-1

The bond order in NO is 2.5 while that in {tex} \mathrm { NO } ^ { + } {/tex} is {tex} 3 . {/tex} Which of the following statements is true for these two species?

A

Bond length in {tex} \mathrm { NO } ^ { + } {/tex} is equal to that in {tex} \mathrm { NO } {/tex}

Bond length in {tex} \mathrm { NO } {/tex} is greater than in {tex} \mathrm { NO } ^ { + } {/tex}

C

Bond length in {tex} \mathrm { NO } ^ { + } {/tex} is greater than in {tex} \mathrm { NO } {/tex}

D

Bond length is unpredictable

Explanation

Q 8.    

Correct4

Incorrect-1

The states of hybridization of boron and oxygen atoms in boric acid {tex} \left( \mathrm { H } _ { 3 } \mathrm { BO } _ { 3 } \right) {/tex} are respectively

A

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

{tex} \mathrm { sp } ^ { 2 } {/tex} and {tex} \mathrm { sp } ^ { 3 } {/tex}

C

{tex} \mathrm { sp } ^ { 2 } {/tex} and {tex} \mathrm { sp } ^ { 2 } {/tex}

D

{tex} \mathrm { sp } ^ { 3 } {/tex} and {tex} \mathrm { sp } ^ { 3 } {/tex}

Explanation

Q 9.    

Correct4

Incorrect-1

Which one of the following has the regular tetrahedral structure?

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

B

{tex} \mathrm { SF } _ { 4 } {/tex}

C

{tex} \mathrm { XeF } _ { 4 } {/tex}

D

{tex} \left[ \mathrm { Ni } ( \mathrm { CN } ) _ { 4 } \right] ^ { 2 - } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

The maximum number of {tex} 90 ^ { \circ } {/tex} angles between bond pair-bond pair of electrons is observed in

A

{tex} \mathrm { dsp } ^ { 2 } {/tex} hybridization

B

{tex} \mathrm { sp } ^ { 3 } \mathrm { d } {/tex} hybridization

C

{tex} \mathrm { dsp } ^ { 3 } {/tex} hybridization

{tex} \mathrm { sp } ^ { 3 } \mathrm { d } ^ { 2 } {/tex} hybridization

Explanation





Q 11.    

Correct4

Incorrect-1

Lattice energy of an ionic compound depends upon

Charge on the ion and size of the ion

B

Packing of ions only

C

Size of the ion only

D

Charge on the ion only

Explanation

Q 12.    

Correct4

Incorrect-1

Which of the following molecules/ions does not contain unpaired electrons?

A

{tex} N _ { 2 } ^ { + } {/tex}

B

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

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

D

{tex} B _ { 2 } {/tex}

Explanation

Q 13.    

Correct4

Incorrect-1

In which of the following molecules/ions are all the bonds not equal?

A

{tex} \mathrm { XeF } _ { 4 } {/tex}

B

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

C

{tex} \mathrm { SF } _ { 4 } {/tex}

{tex} \mathrm { SiF } _ { 4 } {/tex}

Explanation



Q 14.    

Correct4

Incorrect-1

The decreasing values of bond angles from {tex} \mathrm { NH } _ { 3 } \left( 106 ^ { \circ } \right) {/tex} to {tex} \mathrm { SbH } _ { 3 } \left( 101 ^ { \circ } \right) {/tex} down group- 15 of the periodic table is due to

A

decreasing lp-bp repulsion

decreasing electronegativity

C

increasing bp-bp repulsion

D

increasing p-orbital character in {tex} \mathrm { sp } ^ { 3 } {/tex}

Explanation



Q 15.    

Correct4

Incorrect-1

Which of the following species exhibits the diamagnetic behaviour?

A

{tex} \mathrm { NO } {/tex}

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

C

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

D

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

Explanation



Q 16.    

Correct4

Incorrect-1

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic
species, {tex} \mathrm { K } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Mg } ^ { 2 + } , \mathrm { Be } ^ { 2 + } ? {/tex}

A

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { + } < \mathrm { K } ^ { + } {/tex}

B

{tex} \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Ca } ^ { 2 + } {/tex}

C

{tex} \mathrm { Be } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Ca } ^ { 2 + } < \mathrm { Mg } ^ { 2 + } {/tex}

{tex} \mathrm { K } ^ { + } < \mathrm { Ca } ^ { 2 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + } {/tex}

Explanation

Q 17.    

Correct4

Incorrect-1

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?

A

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

B

{tex} \mathrm { C } _ { 2 } \rightarrow \mathrm { C } _ { 2 } ^ { + } {/tex}

{tex} \mathrm { NO } \rightarrow \mathrm { NO } ^ { + } {/tex}

D

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

Explanation

Q 18.    

Correct4

Incorrect-1

Which of the following hydrogen bonds is the strongest?

A

{tex} \mathrm { O } - \mathrm { H } - - - \mathrm { F } {/tex}

B

{tex} \mathrm { O } - \mathrm { H } --- \mathrm { H } {/tex}

{tex} \mathrm { F } - \mathrm { H } --- \mathrm { F } {/tex}

D

{tex} \mathrm { O } - \mathrm { H } - - - \mathrm { O } {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Which one of the following pairs of species have the same bond order?

{tex} \mathrm { CN } ^ { - } {/tex} and {tex} \mathrm { NO } ^ { + } {/tex}

B

{tex} \mathrm { CN } ^ { - } {/tex} and {tex} \mathrm { CN } ^ { + } {/tex}

C

{tex} \mathrm { O } _ { 2 } ^ { - } {/tex} and {tex} \mathrm { CN } ^ { - } {/tex}

D

{tex} \mathrm { NO } ^ { + } {/tex} and {tex} \mathrm { CN } ^ { + } {/tex}

Explanation

Q 20.    

Correct4

Incorrect-1

The bond dissociation energy of {tex} \mathrm { B } - \mathrm { F } {/tex} in {tex} \mathrm { BF } _ { 3 } {/tex} is {tex}646 \, \mathrm { kJ } \mathrm { mol } ^ { - 1 } {/tex} whereas that of {tex} \mathrm { C } - \mathrm { F } {/tex} in {tex} \mathrm { CF } _ { 4 } {/tex} is {tex} 515\, \mathrm{kJ}\mathrm { mol } ^ { - 1 } {/tex} . The correct reason for higher {tex} \mathrm { B } - \mathrm { F } {/tex} bond dissociation energy as compared to that of {tex} \mathrm { C } - \mathrm { F } {/tex} is

A

stronger {tex} \sigma {/tex} bond between {tex} \mathrm { B } {/tex} and {tex} \mathrm { F } {/tex} in {tex} \mathrm { BF } _ { 3 } {/tex} as compared to that between {tex} \mathrm { C } {/tex} and {tex} \mathrm { F } {/tex} in {tex} \mathrm { CF } _ { 4 } {/tex} .

significant {tex} p\pi - p \pi {/tex} interaction between {tex} B {/tex} and {tex} F {/tex} in {tex} B F _ { 3 } {/tex} whereas there is no possibility of such interaction between {tex} C {/tex} and {tex} F {/tex} in {tex} C F _ { 4 } {/tex} .

C

lower degree of {tex}p \pi - \mathrm { p } \pi {/tex} interaction between {tex} \mathrm { B } {/tex} and {tex} \mathrm { F } {/tex} in {tex} \mathrm { BF } _ { 3 } {/tex} than that between {tex} \mathrm { C } {/tex} and {tex} \mathrm { F } {/tex} in {tex} \mathrm { CF } _ { 4 } {/tex}.

D

smaller size of {tex} \mathrm { B } - {/tex} atom as compared to that of {tex} \mathrm { C } {/tex} - atom.

Explanation





Q 21.    

Correct4

Incorrect-1

Using MO theory, predict which of the following species has the shortest bond length?

A

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

B

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

C

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

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

Explanation



Q 22.    

Correct4

Incorrect-1

Among the following the maximum covalent character is shown by the compound

A

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

B

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

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

D

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

Explanation

Q 23.    

Correct4

Incorrect-1

The hybridization of orbitals of N atom in {tex} \mathrm { NO } _ { 3 } ^ { - } , \mathrm { NO } _ { 2 } ^ { + } {/tex} and {tex} \mathrm { NH } _ { 4 } ^ { + } {/tex} are respectively:

A

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

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

C

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

D

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

Explanation







Q 24.    

Correct4

Incorrect-1

The structure of IF{tex}_{ 7 } {/tex} is

A

square pyramidal

B

trigonal bipyramidal

C

octahedral

pentagonal bipyramidal

Explanation



Q 25.    

Correct4

Incorrect-1

Ortho-Nitrophenol is less soluble in water than {tex} p {/tex} - and {tex} m - {/tex} Nitrophenols because:

A

o-Nitrophenol is more volatile steam than those of {tex} m{/tex} and {tex} p{/tex}-isomers.

o-Nitrophenol shows intramolecular H-bonding

C

o-Nitrophenol shows intermolecular H-bonding

D

Melting point of {tex} o - {/tex} Nitrophenol is lower than those of {tex} m {/tex} -and {tex} p {/tex} -isomers.

Explanation