ICSE Class 10 Chemistry
Chapter: Electrolysis
Time: 30 Minutes
Marks: 20
Question 1
(Answer all the questions)
i) Which of the following is a weak electrolyte?
a) Hydrochloric acid
b) Sodium chloride solution
c) Acetic acid
d) Molten sodium chloride
Ans: __________________
ii) During the electrolysis of molten lead bromide, the gas liberated at the anode is
a) Oxygen
b) Bromine vapours
c) Hydrogen
d) Chlorine
Ans: __________________
iii) An electrolyte conducts electricity due to the presence of _________.
a) Molecules
b) Free ions
c) Electrons only
d) Atoms
Ans: __________________
iv) Assertion: Copper is deposited at the cathode during the electrolysis of copper sulphate solution using copper electrodes.
Reason: Copper ions gain electrons at the cathode.
a) Assertion is True but Reason is False
b) Assertion is False but Reason is True
c) Both Assertion and Reason are True and Reason is the correct explanation
d) Both Assertion and Reason are True but Reason is not the correct explanation
Ans: __________________
v) Oxidation always takes place at the ________.
a) Cathode
b) Electrolyte
c) Anode
d) Battery
Ans: __________________
Question 2
Match the following
| Column A | Column B |
|---|---|
| a) Electrolyte used in electroplating with silver | 1) Cathode |
| b) Site of reduction | 2) Silver nitrate solution |
| c) Non-electrolyte | 3) Distilled water |
| d) Product formed at cathode during electrolysis of acidified water | 4) Hydrogen gas |
| e) Electrode connected to the positive terminal | 5) Anode |
Answers
a) ________
b) ________
c) ________
d) ________
e) ________
Question 3
DURING the electrolysis of acidified water using platinum electrodes.
hydrogen ions move towards the cathode and hydroxide ions move towards the anode.
Answer the following questions.
a) Name the electrolyte used.
Ans: ______________________________
b) Which gas is evolved at the anode?
Ans: ______________________________
c) State one observation at the cathode.
Ans: ______________________________
d) Write the balanced equation for the cathode reaction.
Ans: ______________________________
e) Why is dilute sulphuric acid added to water before electrolysis?
Ans: ______________________________
Answer Key
Question 1
i) c) Acetic acid
ii) b) Bromine vapours
iii) b) Free ions
iv) c) Both Assertion and Reason are True and Reason is the correct explanation
v) c) Anode
Question 2
a → 2
b → 1
c → 3
d → 4
e → 5
Question 3
a) Acidified water (dilute sulphuric acid + water)
b) Oxygen gas
c) Bubbles of hydrogen gas are produced at the cathode.
d) 2H⁺ + 2e⁻ → H₂
e) To increase the electrical conductivity of water.
This paper closely follows the ICSE Class 10 format, difficulty level, and pattern of the sample you shared, while using different questions and a different case study.
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