Electrolysis, Class 12 Chemistry NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. The EMF of a cell is related to the equilibrium contant of the cell reaction as

A

B

C

D

Your comments:

Question 1 of 20

2. In an electrolytic cell the signs of the cathode and anode are

positive and negative respectively

negative and positive respectively

both are positive respectively

both are negative respectively

Your comments:

Question 2 of 20

3. In an experiment, the passage of electricity through dil H₂SO₄ for one hour liberates a total of 224 ml of H₂ at S.T.P. The strength of current would be:

0.042 amperes

0.027 amperes

0.27 amperes

0.54 amperes

Your comments:

Question 3 of 20

4. Which of the following statements is true for electrolysis?

Electricty helps to carry out a chemical reaction

Chemical reaction helps to generate electricity

Chemical reaction helps to generate mechanical energy

Potential energy helps to carry out a chemical reaction

Your comments:

Question 4 of 20

5. The passage of current liberates H₂ at cathode and Cl₂ at anode. The solution is :

Water

Sodium chloride in water

Copper chloride in water

Sulphuric acid

Your comments:

Question 5 of 20

6. Products of electrolysis depend upon :

Nature of electrodes

Nature of electrolyte

Solvent used

All of the above

Your comments:

Question 6 of 20

7. Which of the following is an application of electrolysis?

Daniel cell

Fuel cell

Electroplating

Zone refining of metals

Your comments:

Question 7 of 20

8. Electrolysis makes

A spontaneous chemical reaction feasible

A non spontaneous chemical reaction feasible

A spontaneous chemical reaction fast

None of the above

Your comments:

Question 8 of 20

9. The EMF of a chemical cell is positive when free energy change of reaction

< 0

= 0

no relationship of free enrgy change and e.m.f.

> 0

Your comments:

Question 9 of 20

10. The free energy change is related to equilibrium constant as

A

B

C

D

Your comments:

Question 10 of 20

11. During electrolysis

Mechanical energy is converted into chemical energy

Electrical energy is converted into chemical energy

Chemical energy is converted into electrical energy

Chemical energy is converted into mechanical energy

Your comments:

Question 11 of 20

12. Electrolysis of dilute NaCl solution produces Cl₂ at anode. This is because of

Overpotential of H₂

Overpotential of Na

Overpotential of O₂

Overpotential of Cl₂

Your comments:

Question 12 of 20

13. Impure copper has to be purified using electrolysis. Which of the following is correct?

Impure rod should be connected to negative terminal of the battery

A heater should be moved on impure rod

Impure rod should be made to react with I₂

Impure rod should be connected to positive terminal of the battery

Your comments:

Question 13 of 20

14. Faraday's laws of electrolysis are related to:

atomic number of the anion

equivalent mass of the electrolyte

speed of the cation

atomic number of the cation

Your comments:

Question 14 of 20

15. If Z is constant, I is current passed in t second and m is the amount of substance deposited then which one is correct equation that represents the first law of electrolysis

I = mZt

m = Z I t

mI = Zt

mZ = It

Your comments:

Question 15 of 20

16. 4 amperes of current is passed through acidified water for 30 minutes. The volume of hydrogen gas obtained at S.T.P is

0.0432 L

0.836 L

0.1672 L

0.0836 L

Your comments:

Question 16 of 20

17. Calculate the amount of charge required for the reduction of 1 mol of Cr2O72- ions to Cr3+ ions.

6 x 96500 C

4 x 96500 C

96500 C

2 x 96500 C

Your comments:

Question 17 of 20

18. In an electrochemical cell:

potential energy changes into kinatic energy

kinetic energy changes into potential energy

chemical energy changes into electrical energy

kinetic energy changes into chemical energy

Your comments:

Question 18 of 20

19. What is charge on one mole electron known as?

Dell

One Faraday

Quark

Bohr-Magneteon

Your comments:

Question 19 of 20

20. Faraday's second law gives a relationship between mass and

atomic number

Charge

Equivalent mass

Current in Amperes

Your comments:

Question 20 of 20

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