JEE Main > Hydrogen

Explore popular questions from Hydrogen for JEE Main. This collection covers Hydrogen previous year JEE Main questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

Water gas is a mixture of

A

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

B

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

C

{tex} \mathrm { CO } {/tex} and {tex} \mathrm { N } _ { 2 } {/tex}

{tex} \mathrm { CO } {/tex} and {tex} \mathrm { H } _ { 2 } {/tex}

Explanation

Q 2.    

Correct4

Incorrect-1

An orange coloured solution of {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} acidified with {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} and treated with a substance {tex} \mathrm { X } {/tex} gives a blue coloured solution of {tex} \mathrm { CrO } _ { 5 } . {/tex} The substance {tex} \mathrm { X } {/tex} is

A

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

B

{tex}\mathrm {dil. \ HCl}{/tex}

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

D

{tex}\mathrm{conc. HCl}{/tex}

Explanation

Q 3.    

Correct4

Incorrect-1

The number of H-bonds formed by a water molecule is

A

2

B

8

C

1

4

Explanation

Q 4.    

Correct4

Incorrect-1

When {tex}\mathrm{1\ mole}{/tex} of {tex}\mathrm{PbS}{/tex} reacts completely with {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex}

A

{tex} \mathrm { H } _ { 2 } {/tex} is liberated

B

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

{tex}\mathrm{4 \ moles}{/tex} of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} consumed

D

Sulphur is converted to sulphite

Explanation

Q 5.    

Correct4

Incorrect-1

The term hydride gap refers to which region of periodic table?

A

Groups 6 to 9

Groups 7 to 9

C

Groups 7 to 10

D

Groups 5 to 7

Explanation

Q 6.    

Correct4

Incorrect-1

Which one is true about nascent hydrogen?

A

More reactive than molecular hydrogen

B

Can be produced in situ

C

Show similarity exactly with hydrogen in reduction reactions

Both ( 1 ) & ( 2 )

Explanation

Q 7.    

Correct4

Incorrect-1

2-ethyl anthraquinol when oxidised in air produces

A

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

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

C

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

D

{tex} \mathrm { C} _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } {/tex}

Explanation

Q 8.    

Correct4

Incorrect-1

Which are the compounds, which can be oxidised and reduced by {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} in acidic and basic medium respectively?

A

{tex} \left[ \mathrm { K } _ { 2 } \mathrm { O } , \mathrm { NaAlO } _ { 2 } \right] {/tex}

B

{tex} \left[ \mathrm { KMnO } _ { 4 } , \mathrm { K } _ { 2 } \mathrm { MnO } _ { 4 } \right] {/tex}

{tex} \left\{ \mathrm { K } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] , \mathrm { K } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] \right\} {/tex}

D

{tex} \left[ \mathrm { K } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } , \mathrm { K } _ { 4 } \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right]] \right. {/tex}

Explanation


Q 9.    

Correct4

Incorrect-1

In alkaline medium, which elements can produce hydrogen?

{tex} \mathrm { Zn } , \mathrm { Si } {/tex}

B

{tex} \mathrm { Cu } , \mathrm { Ag } {/tex}

C

{tex} \mathrm { Cu } , \mathrm { N } _ { 2 } {/tex}

D

{tex}\mathrm {Al}{/tex}, {tex} \mathrm { C } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

Select the incorrect statement

A

Ortho and para hydrogen are different due to difference in their nuclear spins

Ortho and para hydrogen are different due to difference in their electron spins

C

Para hydrogen has a lower internal energy than that of ortho hydrogen

D

Parahydrogen is more stable at lower temperature

Explanation

Q 11.    

Correct4

Incorrect-1

Hydride ion is a

A

Strong conjugate acid of {tex} \mathrm { H } _ { 2 } {/tex}

Strong conjugate base of {tex} \mathrm { H } _ { 2 } {/tex}

C

Strong conjugate acid of {tex}\mathrm{H^+}{/tex}

D

Strong conjugate base of {tex}\mathrm{H^-}{/tex}

Explanation

Q 12.    

Correct4

Incorrect-1

lonic hydrides react with water to

A

Give acidic solutions

Give basic solutions

C

Produce hydride ions

D

Produce protons

Explanation

Q 13.    

Correct4

Incorrect-1

The boiling point of water is exceptionally high due to

A

Covalent bond between {tex} \mathrm { H } {/tex} and {tex} \mathrm { O } {/tex}

B

Linear shape

Hydrogen bonding

D

Non-linear shape

Explanation

Q 14.    

Correct4

Incorrect-1

Metallic hydrides

A

Are also called interstitial hydrides

B

Are non-stoichiometric, being deficient in hydrogen

C

{tex}\mathrm {Pt} {/tex} and {tex}\mathrm {Pd}{/tex} hydrides are the example of it

Have all properties given above

Explanation

Q 15.    

Correct4

Incorrect-1

The volume strength of {tex} 3.57 \mathrm { M } {/tex} solution of hydrogen peroxide is

A

{tex}30{/tex} volume

{tex}40{/tex} volume

C

{tex}20{/tex} volume

D

{tex}25{/tex} volume

Explanation

Q 16.    

Correct4

Incorrect-1

In the following reaction using isotopic {tex} ^ { 18 } \mathrm { O } {/tex} in {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 }, {/tex}
{tex} 2 \mathrm { MnO } _ { 4 } ^ { - } + 3 \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } ^ { 18 } \rightarrow 2 \mathrm { MnO } _ { 2 } + 3 \mathrm { O } _ { 2 } + 2 \mathrm { H } _ { 2 } \mathrm { O } + 2 \mathrm { OH } ^ { - } {/tex} isotopic oxygen goes

Both with {tex} \mathrm O_ { 2 } {/tex}

B

Both with {tex}\mathrm {MnO} _ { 2 } {/tex}

C

Both with {tex}\mathrm {OH}^{-}{/tex}

D

One with {tex} \mathrm { O } _ { 2 } {/tex} and one with {tex} \mathrm { MnO } _ { 2 } {/tex}

Explanation

Q 17.    

Correct4

Incorrect-1

{tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} can be obtained when following reacts with {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} except with

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

B

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

C

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

D

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

Explanation

Q 18.    

Correct4

Incorrect-1

{tex}10{/tex} volumes of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} means

{tex} 1 \mathrm { \ ml }\ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm { ml } \ \mathrm { O } _ { 2 } {/tex} at {tex}\mathrm {NTP}{/tex}

B

{tex} 1 \mathrm { \ gm } \ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm { \ ml } \ \mathrm { O } _ { 2 } {/tex} at {tex}\mathrm{NTP}{/tex}

C

{tex} 1 \mathrm {\ mol } \ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm {\ ml } \ \mathrm { O } _ { 2 } {/tex} at {tex} \mathrm { NTP } {/tex}

D

{tex} 1 \mathrm { \ ml }\ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 100 \mathrm { \ ml } \ \mathrm { O } _ { 2 } {/tex} at {tex} \mathrm { NTP } {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Out of {tex}\mathrm {LiH}{/tex}, {tex}\mathrm {MgH} _ { 2 } {/tex} and {tex}\mathrm {CuH}{/tex}

A

All are ionic hydrides

B

{tex}\mathrm {LiH, MgH_2,} {/tex}are ionic and {tex}\mathrm {CuH}{/tex} is covalent hydride

C

All are covalent hydrides

{tex}\mathrm {LiH} {/tex} and {tex} \mathrm {MgH}_ { 2 } {/tex} are ionic hydride and {tex}\mathrm {CuH}{/tex} is intermediate hydride

Explanation

Q 20.    

Correct4

Incorrect-1

Consider the following reactions
{tex} \mathrm { I. } {/tex} {tex} \mathrm { AlH } _ { 3} + \mathrm { H } ^ { - } \rightarrow\mathrm {AlH } _4^ { - } {/tex}
{tex} {/tex} {tex}\mathrm { II. } \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { H } ^ { - } \rightarrow \mathrm { H } _ { 2 } + \mathrm { OH } ^ { - } {/tex}
Select the correct statements based on these reactions.

A

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in I and Lewis base in II

{tex} \mathrm { H }^{-} {/tex} is a Lewis base in 1 and Bronsted base in II

C

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in I and Bronsted acid in II

D

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis base in I and II

Explanation

Q 21.    

Correct4

Incorrect-1

Which among the following is interstitial hydride?

A

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

B

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

C

{tex} \mathrm { TiH } _ { 1.7 } {/tex}

All of these

Explanation

Q 22.    

Correct4

Incorrect-1

Heavy water is

A

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} with dissolved {tex} \mathrm { Mg } \left( \mathrm { HCO } _ { 3 } \right) _ { 2 } {/tex}

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

C

{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} with heavy metal impurities

D

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} with {tex} \mathrm { CaCO } _ { 3 } {/tex}

Explanation

Q 23.    

Correct4

Incorrect-1

Dipole moment of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} is non-zero as

A

Two dipole moments are opposite but unequal

B

Two dipole moments are opposite and equal

C

Two dipole moments are equal but not at {tex} 180 ^ { \circ } {/tex}

Two dipole moments are equal but non-planar

Explanation

Q 24.    

Correct4

Incorrect-1

Neutrality of water is due to

A

{tex} \mathrm { pH } = 7 {/tex}

B

Presence of salts

{tex} \left[\mathrm H ^ { + } \right] = \left[ \mathrm{O H} ^ { - } \right] {/tex}

D

Amphoteric nature

Explanation

Q 25.    

Correct4

Incorrect-1

Which of the following cation is stable in water?

A

{tex}\mathrm H ^ { + } {/tex}

B

{tex} \mathrm { Na } ^ { + } {/tex}

C

{tex} \mathrm { K } ^ { + } {/tex}

All of these

Explanation