Electrolysis MCQs Quiz Multiple Choice Questions & Answers

1. A weak electrolyte is one which

1. is feebly ionised in the solution
2. ionises completely
3. is having high electrical conductivity
4. dissociates completely

2. An electrolyte is a

1. sugar
2. cell
3. liquid that conducts electricity
4. metal

3. During electrolysis of NaCI, the gas discharged at the anode is

1. Hydrogen
2. Oxygen
3. None of these
4. Chlorine

4. During electrolysis, anions undergo

1. oxidation, cathode
2. oxidation, anode
3. oxidation, cathode
4. reduction, anode

5. During electrolysis, the electrolyte conducts electricity by the movement of

1. mobile cations and anions
2. electrolyte particles
3. solvent particles
4. delocalized electrons

6. For electrolysis to work, used compound should be a

1. conductor
2. metalloid
3. non conductor
4. insulator

7. Sodium chloride is a

1. weak electrolyte
2. non-electrolyte
3. None of these
4. strong electrolyte

8. The current flow through electrolyte is due to the movement of

1. Electrons
2. Ions
3. None of these
4. Holes

9. The electrode where the current enters the electrolyte is called the

1. conductor
2. anode
3. cathode
4. electric current

10. The material which is to be electroplated

1. is freely kept in the electrolytic tank
2. is connected to the terminal of the cathode
3. is connected to the terminal of the anode
4. can be connected to either cathode or anode

11. The negative electrode in electrolysis is called the

1. cathode
2. gas electrode
3. None of these
4. anode

12. The results of electrolysis of a blue solution using graphite electrodes. Cathode Electrode: Cathode Some reddish brown solids form. The solid does not react Anode Electrode: A gas with a choking smell evolves. The gas can turn moist blue litmus paper red and then white. The solution is probably with dilute hydrochloric aci

1. concentrated copper(II) sulphate solution
2. concentrated sodium iodide solution
3. concentrated sodium chloride solution
4. concentrated copper(II) chloride solution

13. The weak electrolyte among the following is

1. Dilute hydrochloric acid
2. Dilute sulphuric acid
3. Aqueous acetic acid
4. Sodium chloride solution

14. Water is a

1. weak electrolyte
2. non-electrolyte
3. None of these
4. strong electrolyte

15. Water is decomposed into hydrogen and oxygen by means of an electric current by the method of

1. electric heating
2. electroplating
3. None of these
4. electrolysis

16. Which of the following statements about the electrolysis of concentrated potassium iodide solution using graphite electrodes is correct?

1. The mass of the graphite electrodes increases
2. The amount of potassium ions decreases
3. The pH value of the resultant solution increases
4. A brown colour appears around the cathode

17. Which metal is used in electroplating cans to store food?

1. Sn
2. Cr
3. Ag
4. Ni

18. Which of the following is a non-electrolyte

1. Sugar
2. Calcium
3. Potassium
4. Acetic acid

19. Which of the following methods CANNOT reduce the pollution from the electroplating industry?

1. Precipitate out the heavy metal ions in the effluents
2. Neutralize the alkaline effluents with excess sulphuric acid
3. Neutralize the acidic effluents with slaked lime
4. Recover the metal ions for direct reuse

20. Which pair of electrolytes is not inert?

1. Mercury and sodium
2. Silver and Carbon
3. Copper and Silver
4. Mercury and Carbon

21. Which primary cell has the longest life?

1. Lithium cell
2. Carbon zinc cell
3. Alkaline cell
4. Mercury cell