Pure ${{\rm{H}}_2}$ is obtained by the action of:

NaH over ${{\rm{H}}_2}{\rm{O}}$

Electrolysis of warm solution of ${\rm{Ba}}{\left( {{\rm{OH}}} \right)_2}{\rm{.}}$ using Ni electrodes

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JEE • CHEMISTRY • HYDROGEN

Hydrogen practice · Mixed difficulty

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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 61-90 of 179 questions

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61 Easy

61 of 179

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.

62 Medium

62 of 179

Application +4 | -1

The molarity of 20 volume

{H_2}{O_2}

is nearly

View answer and explanation

Correct option: D

1.8

Option D (1.8) is correct because the molarity of

H_2O_2

is calculated using the formula: Molarity = Volume Strength / 11.2.

63 Easy

63 of 179

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.

64 Hard

64 of 179

Analyzing +4 | -1

In which of the following reactions,

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

does not act as reductant?

View answer and explanation

Correct option: A

2 \mathrm{KBr}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{Br}_2+2 \mathrm{KOH}

Option A (

2 \mathrm{KBr}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{Br}_2+2 \mathrm{KOH}

) is correct because in this reaction,

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

acts as an oxidizing agent, not a reducing agent.

65 Medium

65 of 179

Remembering +4 | -1

Which mixture of gases is called synthesis gas?

View answer and explanation

Correct option: A

CO

and

H_2

Option A (

CO

and

H_2

) is correct because synthesis gas, also known as syngas, is a mixture of carbon monoxide (CO) and hydrogen (H₂).

66 Medium

66 of 179

Understanding +4 | -1

When

{H_2}{O_2}

acts as oxidising agent one of the end product generally

View answer and explanation

Correct option: B

{H_2}O

Option B is correct because when H2O2 acts as an oxidizing agent, it is reduced to H2O.

67 Medium

67 of 179

Analyzing +4 | -1

To an aqueous solution containing ions such as

A{l^{3 + ,}}Z{n^{2 + ,\,}}C{a^{2 + ,\,}}F{e^{3 + ,}}N{i^{2 + ,}}B{a^{2 + }}\,and\,\,C{u^{2 + }}

conc.

HCl

was added followed by

{H_2}S

. The total number of cations precipitated during this reaction is/are

View answer and explanation

Correct option: A

Option A is correct because only

C{u^{2 + }}

precipitates as CuS when HCl is added followed by H2S in the given aqueous solution.

68 Easy

68 of 179

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.

69 Easy

69 of 179

Remembering +4 | -1

Calgon used as water softner is

View answer and explanation

Correct option: A

\mathrm{N}{\mathrm{a}_2}\left[ {\mathrm{N}{\mathrm{a}_4}{{\left( {\mathrm{P}{\mathrm{O}_3}} \right)}_6}} \right]

Option A (

\mathrm{N}{\mathrm{a}_2}[ {\mathrm{N}{\mathrm{a}_4}{{\left( {\mathrm{P}{\mathrm{O}_3}} \right)}_6}} ]

) is correct because it represents the chemical formula of Calgon, which is sodium hexametaphosphate.

70 Medium

70 of 179

Understanding +4 | -1

Pure

{\mathrm{H}_2}

is obtained by the action of:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because all the listed methods can be used to obtain pure hydrogen gas.

71 Medium

71 of 179

Analyzing +4 | -1

Identify the inorganic substance which on heating liberates oxygen, turns an acidic solution of KI brown and also reduces acidified

\mathrm{KMnO}_4

solution.

View answer and explanation

Correct option: D

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

Option D (

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

) is correct because hydrogen peroxide liberates oxygen upon heating, turns acidic KI solution brown due to iodine formation, and reduces acidified

\mathrm{KMnO}_4

solution.

72 Easy

72 of 179

Remembering +4 | -1

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

View answer and explanation

Correct option: C

\mathrm{Beta (}{\mathrm{\beta }^ - }\mathrm{)}

Option C (Beta (

{{\beta }}^ -

)) is correct because tritium undergoes beta decay, emitting a beta particle (electron).

73 Medium

73 of 179

Understanding +4 | -1

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting

\left[ {3C{a_3}{{\left( {P{O_4}} \right)}_2} \cdot Ca{{\left( {OH} \right)}_2}} \right]\,

to:

View answer and explanation

Correct option: C

\left[ {3C{a_3}{{\left( {P{O_4}} \right)}_2} \cdot Ca{F_2}} \right]

Option D is correct because fluoride ions convert hydroxyapatite to fluorapatite, which is represented by the formula

\left[ {3\{C{a_3}{{\left( {P{O_4}} \right)}_2}\} \cdot Ca{F_2}} \right]

74 Medium

74 of 179

Remembering +4 | -1

The

O - O - H

bond angle in

{H_2}O

View answer and explanation

Correct option: D

{97^0}

Option D (

{97^0}

) is correct because the O-O-H bond angle in H2O2 is approximately 97 degrees due to the non-planar structure and repulsion between lone pairs.

75 Easy

75 of 179

Analyzing +4 | -1

Which of the following reaction represents the oxidising nature of

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

View answer and explanation

Correct option: D

\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}

Option D (

\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}

) is correct because hydrogen peroxide oxidizes PbS to PbSO4, indicating its oxidizing nature.

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76 Hard

76 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.

77 Medium

77 of 179

Analyzing +4 | -1

Which of the following reaction shows reduction of atom of water molecule:

View answer and explanation

Correct option: A

2{H}_2{O}+2 {Na} \rightarrow 2{NaOH}+{H}_2

The correct answer is A (

2{H}_2{O}+2 {Na} \rightarrow 2{NaOH}+{H}_2

) because in this reaction, water is reduced to hydrogen gas.

78 Medium

78 of 179

Understanding +4 | -1

S-I: Hydrogen shows resemblance with alkali metals as well as halogens.

S-II: Hydrogen exists in atomic form only at high temperature.

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 hydrogen does resemble both alkali metals and halogens in its properties, and it exists in atomic form only at high temperatures.

79 Medium

79 of 179

Remembering +4 | -1

Permanent hardness of water can be removed by

View answer and explanation

Correct option: B

Permutit process

Option B (Permutit process) is correct because the Permutit process uses zeolites to exchange ions and remove permanent hardness.

80 Easy

80 of 179

Remembering +4 | -1

During hydrogenation of oil the catalyst commonly used is:

View answer and explanation

Correct option: B

Option B (Ni) is correct because nickel (Ni) is a commonly used catalyst in the hydrogenation of oils, facilitating the addition of hydrogen to unsaturated fatty acids.

81 Medium

81 of 179

Remembering +4 | -1

Ordinary hydrogen at room temperature is a mixture of

View answer and explanation

Correct option: A

75% Ortho Hydrogen + 25% para Hydrogen

Option A (75% Ortho Hydrogen + 25% para Hydrogen) is correct because at room temperature, ordinary hydrogen exists as a mixture of ortho and para hydrogen in a 3:1 ratio.

82 Medium

82 of 179

Remembering +4 | -1

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

is a

View answer and explanation

Correct option: A

Weak acid

Option A (Weak acid) is correct because hydrogen peroxide (

H_2O_2

) can donate protons, behaving as a weak acid.

83 Easy

83 of 179

Understanding +4 | -1

The sum of number of neutrons and protons in one of the isotopes of hydrogen is:

View answer and explanation

Correct option: A

Option A (3) is correct because tritium, an isotope of hydrogen, has one proton and two neutrons, summing to 3.

84 Medium

84 of 179

Remembering +4 | -1

The following molecules are trapped in the formation of molecular sieves.

View answer and explanation

Correct option: A

{H_2}O,\,\,N{H_3},\,\,\,C{O_2}

Option A (

{H_2}O,\,\,N{H_3},\,\,\,C{O_2}

) is correct because molecular sieves are designed to trap small molecules like water, ammonia, and carbon dioxide within their pores.

85 Medium

85 of 179

Remembering +4 | -1

Fluorine reacts with water to form:

View answer and explanation

Correct option: D

Oxygen, ozone

Option D (Oxygen, ozone) is correct because fluorine reacts with water to produce both oxygen and ozone as products.

86 Easy

86 of 179

Remembering +4 | -1

Which is not a water softener?

View answer and explanation

Correct option: D

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}

Option D (

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}

) is correct because it is not used as a water softener, unlike Calgon, Permutit, and

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

87 Easy

87 of 179

Remembering +4 | -1

Chemical method for removal of temporary hardness of water only is

View answer and explanation

Correct option: B

Clark's method

Option B (Clark's method) is correct because Clark's method, which involves adding lime, specifically removes temporary hardness from water.

88 Easy

88 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.

89 Easy

89 of 179

Remembering +4 | -1

The dihedral angle in gaseous

{H_2}{O_2}

View answer and explanation

Correct option: C

{111.5^0}

Option C (

{111.5^0}

) is correct because the dihedral angle in gaseous

{H_2}{O_2}

is experimentally determined to be approximately 111.5 degrees.

90 Easy

90 of 179

Understanding +4 | -1

The sum of number of neutrons and protons in one of the isotopes of hydrogen is:

View answer and explanation

Correct option: A

Option A (3) is correct because tritium, an isotope of hydrogen, has one proton and two neutrons, summing to 3.

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