$10\% \,\left( {W/V} \right){H_2}{O_2}$

$3\% \,\left( {W/V} \right){H_2}{O_2}$

$100\% \,\left( {W/V} \right){H_2}{O_2}$

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JEE • CHEMISTRY • HYDROGEN

Hydrogen practice · Mixed difficulty

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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 179 questions

1 Medium

1 of 179

Remembering +4 | -1

Hydrogen is prepared on large scale for industrial use

View answer and explanation

Correct option: D

From water gas

Option D (From water gas) is correct because hydrogen is industrially produced on a large scale from water gas through processes like the Bosch process.

2 Medium

2 of 179

Understanding +4 | -1

10 volumes of

{H_2}{O_2}

has a strength of

View answer and explanation

Correct option: A

0.03

Option B (0.3) is correct because the percentage strength is calculated by dividing 17 by 56 and multiplying by the volume strength, which gives approximately 0.3.

3 Medium

3 of 179

Analyzing +4 | -1

The pH of a solution of

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

is 6.0. Some chloride gas is bubbled into this solution. Which of the following is correct?

View answer and explanation

Correct option: C

The pH of resultant solution becomes less than 6.0 and oxygen gas is liberated

Option C (The pH of resultant solution becomes less than 6.0 and oxygen gas is liberated) is correct because the reaction between H2O2 and Cl2 produces HCl, which lowers the pH, and O2.

4 Easy

4 of 179

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.

5 Medium

5 of 179

Analyzing +4 | -1

The pair that yields the same gaseous product on reaction with water:

View answer and explanation

Correct option: B

\mathrm{Ca}\;\mathrm{ and}\;\mathrm{Ca}{\mathrm{H}_2}

Option B is correct because both Calcium (Ca) and Calcium Hydride (CaH₂) react with water to produce Calcium Hydroxide (Ca(OH)₂) and Hydrogen gas (H₂).

6 Medium

6 of 179

Understanding +4 | -1

S-I: The unsaturated fat (oils) are changed to saturated fat by

{H}_2

in presence of finely divided

{Ni}

.

S-II:

{H}_2

Shows addition around doubly bonded carbon atoms.

View answer and explanation

Correct option: A

Both S-I and S-II are correct

Option A (Both S-I and S-II are correct) is correct because unsaturated fats are indeed hydrogenated to saturated fats using Ni as a catalyst, and the hydrogenation occurs at the double bonds.

7 Medium

7 of 179

Remembering +4 | -1

Perhydrol is

View answer and explanation

Correct option: B

30\% \,\left( {W/V} \right){H_2}{O_2}

Option B (

30\% \,\left( {W/V} \right){H_2}{O_2}

) is correct because Perhydrol is a

30\% \,\left( {W/V} \right)

solution of hydrogen peroxide (

H_2O_2

8 Easy

8 of 179

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.

9 Easy

9 of 179

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.

10 Medium

10 of 179

Remembering +4 | -1

Commercial 10 volume

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

is a solution with a strength of approximately

View answer and explanation

Correct option: B

3 \%

Option B (

3 \%

) is correct because commercial 10 volume

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

solution has a strength of approximately 3%.

11 Easy

11 of 179

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.

12 Medium

12 of 179

Understanding +4 | -1

S-I:

{H}_2 {O}_2

has higher boiling point than water

S-II:

{H}_2 {O}_2

has stronger hydrogen bonding interactions than that shown by water

View answer and explanation

Correct option: A

Both S-I and S-II are correct

The correct answer is A (Both S-I and S-II are correct) because hydrogen peroxide has a higher boiling point than water due to stronger hydrogen bonding interactions.

13 Easy

13 of 179

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.

14 Easy

14 of 179

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}

15 Medium

15 of 179

Understanding +4 | -1

When different metals like

Zn,\mathrm{ }Sn,\mathrm{ }Fe

are added to dilute sulphuric acid, same gas, which burns explosively in air, is evolved. The gas is:

View answer and explanation

Correct option: D

{\mathrm{H}_2}

Option D (

{\mathrm{H}_2}

) is correct because all the metals listed react with dilute sulfuric acid to produce hydrogen gas, which is known to burn explosively in air.

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16 Medium

16 of 179

Understanding +4 | -1

Metal which does not react with cold water but evolves

{H_2}

with steam is:

View answer and explanation

Correct option: D

Fe

Option D (

Fe

) is correct because iron does not react with cold water but reacts with steam to produce hydrogen gas.

17 Medium

17 of 179

Remembering +4 | -1

\mathrm{LiAlH}_4

is used as :

View answer and explanation

Correct option: B

A reducing agent

Option B (A reducing agent) is correct because LiAlH4 is a strong reducing agent commonly used in organic chemistry.

18 Medium

18 of 179

Understanding +4 | -1

Which of the following statements in relation to the hydrogen atom is correct?

View answer and explanation

Correct option: A

3 \mathrm{~s}, 3 \mathrm{p}

and

3 \mathrm{~d}

orbitals all have the same energy

Option A (

3 \mathrm{~s}, 3 \mathrm{p}

and

3 \mathrm{~d}

orbitals all have the same energy) is correct because in a hydrogen atom, the energy of an orbital depends only on the principal quantum number (n).

19 Easy

19 of 179

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.

20 Easy

20 of 179

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.

21 Hard

21 of 179

Application +4 | -1

The molecular formula of a commercial resin used for exchanging ions in water softening is

{C_8}{H_7}S{O_3}Na

(mol. wt. = 206). What would be the maximum uptake of

C{a^{2 + }}

ions by the resin when expressed in mole per gram resin?

View answer and explanation

Correct option: D

\frac{2}{{412}}

Option D (2/412) is correct because the maximum uptake of Ca²⁺ ions by the resin is calculated based on the stoichiometry of the ion exchange reaction.

22 Medium

22 of 179

Analyzing +4 | -1

In which of the following reactions does hydrogen act as an oxidising agent:-

View answer and explanation

Correct option: C

\mathrm{Na}+\mathrm{H}_2 \longrightarrow

Option C is correct because in the reaction with Na, hydrogen gains an electron and its oxidation state changes from 0 to -1, thus acting as an oxidizing agent.

23 Hard

23 of 179

Application +4 | -1

A sample of hard water containing

{Ca}^{2+}(\mathrm{aq})

ions, having concentration

400 \, \mathrm{ppm}

is passed through cation exchange resin

({RH})

which exchanges

{Ca}^{2+}(\mathrm{aq})

ions for

{H}^{+}(\mathrm{aq})

. What is the volume of

1 \, \mathrm{M}

{NaOH}

required to neutralise

1 \mathrm{~L}

of water obtained from cation exchange resin after exchange of

{Ca}^{2+}

of hard water?

View answer and explanation

Correct option: A

20 \mathrm{~mL}

Option A (20 mL) is correct because the volume of NaOH required is calculated based on the concentration of Ca2+ ions and the stoichiometry of the neutralization reaction.

24 Medium

24 of 179

Remembering +4 | -1

In solid hydrogen the intermolecular bonding is

View answer and explanation

Correct option: B

Vander waals

Option B (Vander waals) is correct because solid hydrogen molecules are held together by weak van der Waals forces.

25 Medium

25 of 179

Remembering +4 | -1

One of the electrolyte used for the manufacture of

{H_2}{O_2}

by electrolytic method

View answer and explanation

Correct option: C

50\% \,{H_2}S{O_4}

Option C (

50\% \,{H_2}S{O_4}

) is correct because the electrolysis of 50% sulfuric acid is a method used for the manufacture of hydrogen peroxide.

26 Easy

26 of 179

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.

27 Easy

27 of 179

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.

28 Medium

28 of 179

Remembering +4 | -1

The chemical formula of zeolite is

View answer and explanation

Correct option: C

N{a_2}A{l_2}S{i_2}{O_8}x{H_2}O

Option C (

N{a_2}A{l_2}S{i_2}{O_8}x{H_2}O

) is correct because it represents the general formula for zeolites, which are hydrated aluminosilicates of alkali or alkaline earth metals.

29 Medium

29 of 179

Analyzing +4 | -1

The correct statements among (1) to (4) are:
1. Saline hydrides produce

{H_2}

gas when reacted with

{H_2}O

2) Reaction of

LiAl{H_4}

with

B{F_3}

leads to

{B_2}{H_6}

P{H_3}

and

C{H_4}

are electron rich and electron precise hydrides, respectively
4)

HF\mathrm{ }

and

C{H_4}

are called as molecular hydrides

View answer and explanation

Correct option: A

(1), (2), (3) and (4)

Option A is correct because all four statements about hydrides are accurate and well-established chemical facts.

30 Medium

30 of 179

Remembering +4 | -1

Which one of the following chemical agent is not being used for dry cleaning of clothes?

View answer and explanation

Correct option: B

CC{l_4}

Option B (

CC{l_4}

) is correct because carbon tetrachloride (

CC{l_4}

) is no longer used for dry cleaning due to its toxicity and corrosive properties; other options are used.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 179 single-correct-answer MCQs on HYDROGEN.
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