Electrolysis MCQ Quiz - Multiple Choice Questions & Answers Page 2

11. The negative electrode in electrolysis is called the

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

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

13. The weak electrolyte among the following is

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

14. Water is a

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

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

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

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

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

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

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

18. Which of the following is a non-electrolyte

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

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

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

20. Which pair of electrolytes is not inert?

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