10 Volume ${{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}$ means

1 gr ${{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}$ gives $10\,ml\,{O_2}$ at NTP

$1\,mol\,{H_2}{O_2}$ gives $10\,ml\,{O_2}\,$ at NTP

Both para and ortho hydrogen exist

The O—O bond length in ${{\rm{H}}_2}{{\rm{O}}_2}$ is:

$1.48\mathop {\rm A}\limits^ \circ $

$1.54\mathop {\rm A}\limits^ \circ $

$1.34{\rm{ }}\mathop {\rm A}\limits^ \circ $

$1.01{\rm{ }}\mathop {\rm A}\limits^ \circ $

${{\rm{H}}_2}{{\rm{O}}_2}$ is stored in:

Iron container after addition of stabilizer

Glass container after addition of stabilizer

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JEE • CHEMISTRY • HYDROGEN

Hydrogen practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 76 questions

1 Easy

1 of 76

Remembering +4 | -1

An aqueous solution of hydrogen peroxide is

View answer and explanation

Correct option: D

Weakly acidic

Option D (Weakly acidic) is correct because hydrogen peroxide in water donates a proton, acting as a weak acid.

2 Easy

2 of 76

Remembering +4 | -1

The volume strength of perhydrol is

View answer and explanation

Correct option: C

100

Option C (100) is correct because perhydrol is a 30% solution of

H_2O_2

, which corresponds to a volume strength of 100.

3 Easy

3 of 76

Understanding +4 | -1

The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is

View answer and explanation

Correct option: C

The correct answer is 4 because the heaviest isotope of hydrogen is Tritium (H-3), which has 1 proton, 2 neutrons, and 1 electron, summing to 4.

4 Easy

4 of 76

Understanding +4 | -1

When electric current is passed through an ionic hydride in the molten state,

View answer and explanation

Correct option: B

Hydrogen is liberated at the anode

Option B (Hydrogen is liberated at the anode) is correct because in ionic hydrides, the hydride ion (

{\mathrm{H}^ - }

) migrates to the anode and gets oxidized to hydrogen gas.

5 Easy

5 of 76

Application +4 | -1

Commercial 11.2 volume

{H_2}{O_2}

solution has a molarity of

View answer and explanation

Correct option: A

Option A (1) is correct because the molarity of a commercial 11.2 volume

{H_2}{O_2}

solution is calculated using the formula: Volume strength = 11.2 × molarity.

6 Easy

6 of 76

Understanding +4 | -1

Solubility of salts in

\mathrm{D}_2 \mathrm{O}

is lower than in

\mathrm{H}_2 \mathrm{O}

because of

View answer and explanation

Correct option: C

Lower dielectric constant of

\mathrm{D}_2 \mathrm{O}

Option C (Lower dielectric constant of

\mathrm{D}_2 \mathrm{O}

) is correct because a lower dielectric constant means

\mathrm{D}_2 \mathrm{O}

is less effective at solvating ionic compounds compared to

\mathrm{H}_2 \mathrm{O}

7 Easy

7 of 76

Remembering +4 | -1

The composition of Tritium is

View answer and explanation

Correct option: C

1 electron, 1 proton, 2 neutrons

Option C (1 electron, 1 proton, 2 neutrons) is correct because Tritium, an isotope of hydrogen, has 1 proton, 2 neutrons, and 1 electron.

8 Easy

8 of 76

Remembering +4 | -1

Ordinary hydrogen is a mixture at:

View answer and explanation

Correct option: A

75\mathrm{\% }\;\mathrm{ ortho}\;{\mathrm{H}_2} + 25\mathrm{\% }\;\mathrm{para}\;{\mathrm{H}_2}

Option A (

75\mathrm{\% }\;\mathrm{ ortho}\;{\mathrm{H}_2} + 25\mathrm{\% }\;\mathrm{para}\;{\mathrm{H}_2}

) is correct because ordinary hydrogen exists as a mixture of 75% ortho hydrogen and 25% para hydrogen at room temperature.

9 Easy

9 of 76

Remembering +4 | -1

Which can adsorb large volumes of hydrogen gas?

View answer and explanation

Correct option: A

Colloidal solution of palladium

Option A (Colloidal solution of palladium) is correct because colloidal palladium has a large surface area, allowing it to adsorb large volumes of hydrogen gas.

10 Easy

10 of 76

Application +4 | -1

Hydrogen has 3 isotopes, the number of possible di atomic molecules will be

View answer and explanation

Correct option: B

Option B (6) is correct because there are 6 possible combinations of diatomic molecules formed from 3 isotopes of hydrogen.

11 Easy

11 of 76

Remembering +4 | -1

The bleaching properties of

{\mathrm{H}_2}{\mathrm{O}_2}

are due to its:

View answer and explanation

Correct option: B

Oxidizing properties

Option B (Oxidizing properties) is correct because hydrogen peroxide acts as a bleaching agent due to its ability to oxidize colored substances.

12 Easy

12 of 76

Remembering +4 | -1

The exhausted Permutit is generally regenerated by percolating through it a solution of:

View answer and explanation

Correct option: A

Sodium chloride

Option A (Sodium chloride) is correct because sodium chloride solution is used to regenerate exhausted Permutit by replacing calcium and magnesium ions with sodium ions.

13 Easy

13 of 76

Understanding +4 | -1

10 Volume

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

means

View answer and explanation

Correct option: A

1\,ml\,{H_2}{O_2}

gives

10\,ml\,{O_2}

at NTP

Option A (

1\,ml\,{H_2}{O_2}

gives

10\,ml\,{O_2}

at NTP) is correct because it accurately defines the volume strength of hydrogen peroxide.

14 Easy

14 of 76

Remembering +4 | -1

Tritium is obtained by:

View answer and explanation

Correct option: A

Nuclear reactions

Option A (Nuclear reactions) is correct because Tritium is a radioactive isotope of hydrogen produced through nuclear reactions.

15 Easy

15 of 76

Application +4 | -1

Given

(A)

2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_1^\theta=-\mathrm{xkJ} \mathrm{mol}^{-1}

(B)

\mathrm{C}

(graphite

)+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_2^\theta=-\mathrm{ykmol}^{-1}

The

\Delta \mathrm{H}^\theta

for the reaction

\mathrm{C}(

graphite

)+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})

View answer and explanation

Correct option: C

\frac{x-2 y}{2}

Option C (

\frac{x-2 y}{2}

) is correct because it is derived from Hess's Law by manipulating the given equations to obtain the desired reaction.

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16 Easy

16 of 76

Understanding +4 | -1

At absolute zero:

View answer and explanation

Correct option: A

Only para hydrogen exists

Option A (Only para hydrogen exists) is correct because at absolute zero, the lowest energy state is favored, and para-hydrogen has a lower energy state than ortho-hydrogen.

17 Easy

17 of 76

Remembering +4 | -1

Density of water is maximum at :

View answer and explanation

Correct option: C

4^\circ \mathrm{C}

Option C (

4^{\circ} \mathrm{C}

) is correct because water has its maximum density at 4 degrees Celsius.

18 Easy

18 of 76

Remembering +4 | -1

Which of the following is used as a moderator in nuclear reactors.

View answer and explanation

Correct option: B

heavy water

Option B (heavy water) is the correct answer because heavy water (D2O) is an effective moderator due to its ability to slow down neutrons without significant absorption.

19 Easy

19 of 76

Remembering +4 | -1

The O—O bond length in

{\mathrm{H}_2}{\mathrm{O}_2}

is:

View answer and explanation

Correct option: B

1.48\mathop \mathrm{A}\limits^ \circ

Option B (

1.48\mathop \mathrm{A}\limits^ \circ

) is correct because the O-O bond length in

H_2O_2

is experimentally determined to be approximately 1.48 Angstroms.

20 Easy

20 of 76

Understanding +4 | -1

Which of the following gives

{H_2}{O_2}

on hydrolysis?

View answer and explanation

Correct option: B

{H_2}S{O_5}

The correct answer is B (

{H_2}S{O_5}

) because its hydrolysis yields sulphuric acid and hydrogen peroxide (

{H_2}{O_2}

21 Easy

21 of 76

Remembering +4 | -1

Which physical property of dihydrogen is wrong

View answer and explanation

Correct option: D

Non-inflammable gas

Option D (Non-inflammable gas) is correct because dihydrogen (H₂) is highly flammable and readily combusts with oxygen.

22 Easy

22 of 76

Application +4 | -1

The number of protons, electrons and neutrons respectively in a molecule of heavy water is:

View answer and explanation

Correct option: A

10,\mathrm{ }10,\mathrm{ }10

The correct answer is

10,\mathrm{ }10,\mathrm{ }10

because heavy water (

D_2O

) has 2 deuterium atoms (1 proton, 1 neutron, 1 electron each) and 1 oxygen atom (8 protons, 8 neutrons, 8 electrons).

23 Easy

23 of 76

Remembering +4 | -1

Which one of the following is called amphoteric solvent?

View answer and explanation

Correct option: D

Water

Option D (Water) is correct because water is an amphoteric solvent, meaning it can act as both an acid and a base.

24 Easy

24 of 76

Remembering +4 | -1

Permutit is:

View answer and explanation

Correct option: A

Hydrated sodium aluminium silicate

Option A (Hydrated sodium aluminium silicate) is correct because Permutit is a synthetic zeolite, which is a hydrated sodium aluminum silicate used for water softening.

25 Easy

25 of 76

Remembering +4 | -1

{\mathrm{H}_2}{\mathrm{O}_2}

is stored in:

View answer and explanation

Correct option: C

Plastic container after addition of stabilizer

Option C is correct because H₂O₂ is stored in plastic containers with stabilizers to prevent decomposition, which can be catalyzed by metal ions.

26 Easy

26 of 76

Remembering +4 | -1

The maximum possible number of hydrogen bonds a water molecule can form is:

View answer and explanation

Correct option: D

Option D (4) is correct because a water molecule can form two hydrogen bonds through its two hydrogen atoms and accept two hydrogen bonds through its two lone pairs on the oxygen atom.

27 Easy

27 of 76

Remembering +4 | -1

The electronic configuration of deuterium is:

View answer and explanation

Correct option: D

1{s^1}

Option D (

1{s^1}

) is correct because deuterium is an isotope of hydrogen with one proton and one neutron, thus having only one electron with the electronic configuration of

1{s^1}

28 Easy

28 of 76

Remembering +4 | -1

Exhausted permutit is:-

View answer and explanation

Correct option: C

CaA{l_2}S{i_2}{O_8}\, \cdot \,x\,{H_2}O

Option C (

CaA{l_2}S{i_2}{O_8}\, \cdot \,x\,{H_2}O

) is correct because exhausted permutit contains calcium ions after the exchange process.

29 Easy

29 of 76

Understanding +4 | -1

The temperory hardness of water sample is due to compound X. Boiling this sample converts X to compound Y, X and Y are

View answer and explanation

Correct option: A

\mathrm{Mg}{\left( {\mathrm{HC}{\mathrm{O}_\mathrm{3}}} \right)_\mathrm{2}}

and

\mathrm{Mg}{\left( {\mathrm{OH}} \right)_\mathrm{2}}

The correct answer is A (

\mathrm{Mg}{\left( {\mathrm{HC}{\mathrm{O}_\mathrm{3}}} \right)_\mathrm{2}}

and

\mathrm{Mg}{\left( {\mathrm{OH}} \right)_\mathrm{2}}

) because magnesium bicarbonate decomposes upon boiling to form magnesium hydroxide, which is insoluble.

30 Easy

30 of 76

Understanding +4 | -1

Decomposition of

{H_2}{O_2}

is accompanied by:

View answer and explanation

Correct option: A

Decrease in free energy

Option A (Decrease in free energy) is correct because the decomposition of H2O2 is a spontaneous process, which is always accompanied by a decrease in free energy.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 76 single-correct-answer MCQs on HYDROGEN.
✓ Try each question before opening its answer. Read the explanation where one is available.
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