# JEE Main

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

## Mathematics

Hydrogen

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Q 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

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Q 2. 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

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Q 3. The maximum number of hydrogen bonds formed by a water molecule in ice is:

A

2

B

8

C

1

4

##### Explanation

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Q 4. The oxide that gives H{tex}_2{/tex}O{tex}_2{/tex} on treatment with a dilute acid is :

A

PbO{tex}_2{/tex}

Na{tex}_2{/tex}O{tex}_2{/tex}

C

MnO{tex}_2{/tex}

D

TiO{tex}_2{/tex}

##### Explanation

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Q 5. {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

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Q 6. {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

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Q 7. 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

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Q 8. 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

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Q 9. 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

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Q 10. 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

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Q 11. Hydrogen is evolved by the action of cold dilute {tex}\mathrm{HNO_3}{/tex} on

A

Fe

Mg or Mn

C

Cu

D

AI

##### Explanation

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Q 12. 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