Class 11 Chemistry Chapter 9 Hydrogen MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 9 Hydrogen. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practising these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

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Class 11 Hydrogen MCQs

1. Hardness of water is due to the pair of ions

(a) Ca2+ and K+

(b) Mg2+ and K+

(c) Ca2+ and Mg2+

(d) Ba2+ and Zn2+

Ans: (c)

Solution: Ca2+ and Mg2+ ions cause the hardness of water.

2. Nascent hydrogen consists of

(a) Hydrogen atoms with excess energy

(b) Hydrogen molecules with excess energy

(c) Hydrogen ions within the excited state

(d) Solvated protons

Ans: (a)

Solution: Nascent hydrogen [H] consists of hydrogen atoms with excess energy.

3. Moist H2O2 cannot be dried over conc. H2SO4 because:

(a) it can catch fire

(b) it is reduced by H2SO4

(c) it is oxidised by H2SO4

(d) None of these is true

Ans: (c)

Solution: Moist H2O2 cannot be dried over conc. H2SO4 because it is oxidised by H2SO4

4. The adsorption of hydrogen by palladium is called ———–

(a) Hydrogenation

(b) Hydration

(c) Reduction

(d) Occlusion

Ans: (d)

Solution: Adsorption of  gas on the metal surface is called occlusion.

5. Which is used as a moderator in a nuclear reactor?

(a) H2O

(b) Alum

(c) D2O

(d) Any of these

Ans: (c)

Solution: D2O (Heavy water) is used as a moderator in nuclear reactors.

6. Zeolite used to soften hardness of water is hydrated:

(a) Potassium aluminium borate

(b) Sodium aluminium silicate

(c) Calcium aluminium silicate

(d) Zinc aluminium borate

Ans: (b)

Solution: Zeolite used to soften the hardness of water is hydrated sodium aluminium silicate.

7. Permanent hardness from water can be removed by adding ————-

(a) Na2CO3

(b) K

(c) Ca(OCl)Cl

(d) Cl2

Ans: (a)

Solution: Na2CO3 removes permanent hardness from water

8. The reagent(s) used for softening the temporary hardness of water is(are) ———-

(a) Ca3(PO4)2

(b) Ca(OH)2

(c) Na2CO3

(d) Cl2

Ans: (b, c)

Solution: Both Ca(OH)2 and Na2CO3 can remove temporary hardness from water.

9. Which of the following statements about hydrogen is incorrect?

(a) Hydronium ion, H3O+ exists freely in solution.

(b) Dihydrogen does not act as a reducing agent.

(c) Hydrogen has three isotopes of which tritium is the most common.

(d) Hydrogen never acts as a cation in ionic salts.

Ans: (b , c)

Solution: Dihydrogen can act as a powerful reducing agent.

Example CuO + H2 → Cu + H2O.

Out of three isotopes, protium (1H1) is the most common.

10. Water softening by Clarke’s process uses:

(a) Calcium bicarbonate

(b) Sodium bicarbonate

(c) potash alum

(d) Calcium hydroxide

Ans: (d)

Solution: Water softening by Clarke’s process uses calcium hydroxide.

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