Which reaction shows oxidizing nature of ${{\rm{H}}_2}{{\rm{O}}_2}$?

${{\rm{H}}_2}{{\rm{O}}_2} + 2{\rm{KI}} \to 2{\rm{KOH}} + {{\rm{I}}_2}$

${\rm{C}}{{\rm{l}}_2} + {{\rm{H}}_2}{{\rm{O}}_2} \to 2{\rm{HCl}} + {{\rm{O}}_2}$

${{\rm{H}}_2}{{\rm{O}}_2} + {\rm{A}}{{\rm{g}}_2}{\rm{O}} \to 2{\rm{Ag}} + {{\rm{H}}_2}{\rm{O}} + {{\rm{O}}_2}$

${\rm{NaClO}} + {{\rm{H}}_2}{{\rm{O}}_2} \to {\rm{NaCl}} + {{\rm{H}}_2}{\rm{O}} + {{\rm{O}}_2}$

Which is true statement about ${D_2}O\,\,{\rm{and}}\,{H_2}O$

$NaCl$ is more soluble in ${D_2}O\,\,$ than in ${H_2}O\,$

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NEET • CHEMISTRY • HYDROGEN

Hydrogen practice · Easy

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Showing 1-30 of 78 questions

1 Easy

1 of 78

Understanding +4 | -1

Hydrogen accepts an electron to form inert gas configuration. In this it resembles

View answer and explanation

Correct option: A

halogens

Option A (halogens) is correct because hydrogen needs one electron to achieve an inert gas configuration, similar to halogens.

2 Easy

2 of 78

Application +4 | -1

\mathrm{CaC}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_2+' \mathrm{X}\,'

\mathrm{Mg}_2 \mathrm{C}_3+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Mg}(\mathrm{OH})_2+'\mathrm{Y}\,'

The products '

\mathrm{X}

' and '

\mathrm{Y}

' respectively are

View answer and explanation

Correct option: B

\mathrm{C}_2 \mathrm{H}_2

and

\mathrm{C}_3 \mathrm{H}_4

Option B (

\mathrm{C}_2 \mathrm{H}_2

and

\mathrm{C}_3 \mathrm{H}_4

) is correct because the hydrolysis of

\mathrm{CaC}_2

produces acetylene (

\mathrm{C}_2 \mathrm{H}_2

) and the hydrolysis of

\mathrm{Mg}_2 \mathrm{C}_3

produces propyne (

\mathrm{C}_3 \mathrm{H}_4

3 Easy

3 of 78

Understanding +4 | -1

{H_2}{O_2} \to 2{H^ + } + {O_2} + 2{e^ - };{E^0} = - 0.68V

This equation represents which of the following behaviour of

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

View answer and explanation

Correct option: A

reducing

Option A is correct because the equation

{H_2}{O_2} \to 2{H^ + } + {O_2} + 2{e^ - };{E^0} = - 0.68V

represents the reducing behavior of

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

, as it is losing electrons.

4 Easy

4 of 78

Analyzing +4 | -1

Which reaction shows oxidizing nature of

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

View answer and explanation

Correct option: A

{\mathrm{H}_2}{\mathrm{O}_2} + 2\mathrm{KI} \to 2\mathrm{KOH} + {\mathrm{I}_2}

Option A (

{\mathrm{H}_2}{\mathrm{O}_2} + 2\mathrm{KI} \to 2\mathrm{KOH} + {\mathrm{I}_2}

) is correct because

H_2O_2

oxidizes

KI

I_2

, indicating its oxidizing nature.

5 Easy

5 of 78

Understanding +4 | -1

Which of the following could act as propellent for rockets.

View answer and explanation

Correct option: A

Liq.

{H_2} + Liq.{O_2}

Option A (Liq.

{H_2} + Liq.{O_2}

) is correct because liquid hydrogen and liquid oxygen are a common and highly energetic propellant combination for rockets.

6 Easy

6 of 78

Remembering +4 | -1

Triple point of water is

View answer and explanation

Correct option: C

273 K

Option C is correct because the triple point of water is defined as the temperature and pressure at which water can exist in equilibrium in the solid, liquid, and gaseous phases, which is approximately 273.16 K (0.01 °C).

7 Easy

7 of 78

Understanding +4 | -1

Hard water when passed through ion exchange resin containing

R - COOH

group, becomes free atom

View answer and explanation

Correct option: D

C{a^{ + 2}}

Option D is correct because the ion exchange resin replaces the calcium ions with hydrogen ions, thus removing calcium.

8 Easy

8 of 78

Remembering +4 | -1

High boiling point of water is due to:

View answer and explanation

Correct option: B

Hydrogen bonding

Option B is correct because the high boiling point of water is primarily due to the presence of strong hydrogen bonds between water molecules.

9 Easy

9 of 78

Understanding +4 | -1

Ortho Hydrogen and para Hydrogen resemble in which of the following property

View answer and explanation

Correct option: C

chemical properties

Option C (chemical properties) is correct because ortho and para hydrogen are allotropes that differ in nuclear spin but have the same chemical properties.

10 Easy

10 of 78

Understanding +4 | -1

Which of the following pair of ions makes the water hard

View answer and explanation

Correct option: B

C{a^{2 + }},HCO_3^ -

Option B is correct because calcium and bicarbonate ions are the primary contributors to water hardness, especially temporary hardness.

11 Easy

11 of 78

Remembering +4 | -1

Permanent hardness can be removed by adding

View answer and explanation

Correct option: B

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

Option B (

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

) is correct because sodium carbonate (washing soda) is used to precipitate out the calcium and magnesium ions that cause permanent hardness.

12 Easy

12 of 78

Application +4 | -1

The amount of

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

present in  1 L  of

1.5\;N\;{\mathrm{H}_2}{\mathrm{O}_2}

solution is:

View answer and explanation

Correct option: B

25.5\;\mathrm{g}

The amount of H2O2 present in 1 L of 1.5 N H2O2 solution is 25.5 g because normality is used to calculate the mass of H2O2.

13 Easy

13 of 78

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 is the correct chemical formula for Calgon.

14 Easy

14 of 78

Understanding +4 | -1

Blackened oil painting can be restored into original form by the action of

View answer and explanation

Correct option: B

{H_2}{O_2}

Option B (

{H_2}{O_2}

) is correct because hydrogen peroxide acts as a bleaching agent and oxidizes the blackened lead sulfide to lead sulfate, restoring the original color.

15 Easy

15 of 78

Analyzing +4 | -1

Which of the following cannot be oxidized by

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

View answer and explanation

Correct option: B

\mathrm{O}_3

Option B (

\mathrm{O}_3

) is correct because ozone cannot be further oxidized by

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

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16 Easy

16 of 78

Understanding +4 | -1

The property of hydrogen which distinguishes it from alkali metals is

View answer and explanation

Correct option: D

Its metallic character

Option D (Its metallic character) is correct because hydrogen lacks metallic character, unlike alkali metals.

17 Easy

17 of 78

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}

Ordinary hydrogen is a mixture of 75% ortho hydrogen and 25% para hydrogen at room temperature because this is the statistically favored distribution.

18 Easy

18 of 78

Understanding +4 | -1

The percentage of para hydrogen in ordinary hydrogen increases when:

View answer and explanation

Correct option: A

Temperature is lowered

Option A (Temperature is lowered) is correct because the equilibrium shifts towards para hydrogen at lower temperatures.

19 Easy

19 of 78

Understanding +4 | -1

Which is true statement about

{D_2}O\,\,\mathrm{and}\,{H_2}O

View answer and explanation

Correct option: A

{D_2}O

has lower dielectric constant than

{H_2}O

Option A (

{D_2}O

has lower dielectric constant than

{H_2}O

) is correct because

{D_2}O

has a slightly lower dielectric constant due to its larger mass and lower vibrational frequencies.

20 Easy

20 of 78

Understanding +4 | -1

Temporary hardness may be removed from water by adding

View answer and explanation

Correct option: B

Ca{\left( {OH} \right)_2}

Option B is correct because adding calcium hydroxide (slaked lime) precipitates calcium carbonate, removing temporary hardness.

21 Easy

21 of 78

Remembering +4 | -1

Heavy water is represented as

View answer and explanation

Correct option: B

{\mathrm{D}_2}\mathrm{O}

Option C (syn gas) is correct because synthesis gas (syn gas) is a mixture of carbon monoxide and hydrogen, which is used in the production of methanol.

22 Easy

22 of 78

Understanding +4 | -1

Saline hydrides react explosively with water, such fires can be extinguished by

View answer and explanation

Correct option: C

Sand

Option C (Sand) is correct because sand can smother the fire and prevent it from spreading, while water and carbon dioxide can react with the hydride.

23 Easy

23 of 78

Application +4 | -1

The best method to test whether a clear liquid is water, is to:

View answer and explanation

Correct option: D

Add few drops on anhydrous copper sulphate and look for colour change

Option D (Add few drops on anhydrous copper sulphate and look for colour change) is correct because anhydrous copper sulphate turns blue in the presence of water.

24 Easy

24 of 78

Remembering +4 | -1

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

is used as

View answer and explanation

Correct option: D

All

Option D (All) is correct because H2O2 is used as an antiseptic, bleaching agent, and propellant.

25 Easy

25 of 78

Remembering +4 | -1

Heavy water freezes at:

View answer and explanation

Correct option: B

3.8\mathrm{ }^\circ C

Heavy water freezes at 3.8 °C because the deuterium isotope causes stronger intermolecular forces compared to ordinary water.

26 Easy

26 of 78

Understanding +4 | -1

In one of these compounds does hydrogen have an oxidation state of

- 1

View answer and explanation

Correct option: D

Ca{H_2}

Option D (

Ca{H_2}

) is correct because in

Ca{H_2}

, Calcium is +2 and Hydrogen is -1.

27 Easy

27 of 78

Understanding +4 | -1

Para and ortho

{\mathrm{H}_2}

differ in

View answer and explanation

Correct option: C

spin of protons

Option C (spin of protons) is correct because para and ortho

{\mathrm{H}_2}

differ in the relative spins of their protons (anti-parallel vs. parallel).

28 Easy

28 of 78

Remembering +4 | -1

Hydrogen was discovered by:

View answer and explanation

Correct option: C

Cavendish

Option C is correct because Henry Cavendish is credited with the discovery of hydrogen as a distinct element.

29 Easy

29 of 78

Understanding +4 | -1

What is formed when calcium carbide react with heavy water?

View answer and explanation

Correct option: A

{\mathrm{C}_2}{\mathrm{D}_2}

Option A (

{\mathrm{C}_2}{\mathrm{D}_2}

) is correct because calcium carbide reacts with heavy water to produce deuterated acetylene (

{\mathrm{C}_2}{\mathrm{D}_2}

30 Easy

30 of 78

Understanding +4 | -1

Which of the following is correct about heavy water?

View answer and explanation

Correct option: C

It is formed by the combination of heavier isotope of hydrogen and oxygen

Option C (It is formed by the combination of heavier isotope of hydrogen and oxygen) is correct because heavy water (

D_2O

) is formed by deuterium, the heavier isotope of hydrogen, and oxygen.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 78 single-correct-answer MCQs on HYDROGEN.
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