Electrolysis MCQs Class 8
Electrolysis – MCQs with Answers & Explanations
Class: 8 |
Subject: Science
Section: 14 – Chemical Effects of Electric Current
Topic: Electrolysis
Board: CBSE Board Examination (Based on NCERT Syllabus)
Section: 14 – Chemical Effects of Electric Current
Topic: Electrolysis
Board: CBSE Board Examination (Based on NCERT Syllabus)
1. Electrolysis is the process of:
Answer: B
Electrolysis uses electric current to break compounds into simpler substances through chemical reactions.
Electrolysis uses electric current to break compounds into simpler substances through chemical reactions.
2. The liquid used in electrolysis is called:
Answer: B
Electrolytes conduct electricity due to mobile ions.
Electrolytes conduct electricity due to mobile ions.
3. Electrodes are:
Answer: B
Electrodes allow current to enter and leave the electrolyte.
Electrodes allow current to enter and leave the electrolyte.
4. The electrode connected to the positive terminal:
Answer: B — Anode
Oxidation reactions occur at the anode.
Oxidation reactions occur at the anode.
5. The electrode connected to the negative terminal:
Answer: B — Cathode
Reduction reactions occur at the cathode.
Reduction reactions occur at the cathode.
6. Gas bubbles at electrodes indicate:
Answer: B
Electrolysis causes decomposition producing gases.
Electrolysis causes decomposition producing gases.
7. Electrolysis of water produces:
Answer: C
Hydrogen forms at cathode, oxygen at anode.
Hydrogen forms at cathode, oxygen at anode.
8. Volume of hydrogen produced is:
Answer: B
Water splits in 2:1 ratio of hydrogen to oxygen.
Water splits in 2:1 ratio of hydrogen to oxygen.
9. Copper electrolysis deposits copper at:
Answer: B
10. Electrolysis requires:
Answer: D
11. Distilled water needs salt because:
Answer: B
12. Electrolysis is example of:
Answer: A
13. Negative ions move to:
Answer: B
14. Positive ions move to:
Answer: A
15. Electrolysis is used in:
Answer: D
16. Oxygen collects at:
Answer: B
17. Hydrogen collects at:
Answer: A
18. Electrolyte must contain:
Answer: A
19. Example of electrolyte:
Answer: A
20. Electrolysis converts electrical energy into:
Answer: A
