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

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

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

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

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

Question 5 of 20

6. Products of electrolysis depend upon :

 Nature of electrodes

 Nature of electrolyte

 Solvent used

 All of the above

Question 6 of 20

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

 Daniel cell

 Fuel cell

 Electroplating

 Zone refining of metals

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

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

Question 9 of 20

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

 A

 B

 C

 D

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

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

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

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

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

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

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

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

Question 18 of 20

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

 Dell

 One Faraday

 Quark

 Bohr-Magneteon

Question 19 of 20

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

 atomic number

 Charge

  Equivalent mass

 Current in Amperes

Question 20 of 20

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