Electrochemistry | Past Year Paper Chemistry MCQs | mosaicbro.com

Electrochemistry | Past Year Paper Chemistry MCQs

7 of 29 questions (Page 1 of 5)

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1 Reduction always takes place:
Correct Answer: B
Explanation: Reduction (gain of electrons) occurs at the cathode in electrochemical cells.
2 The electrolyte KOH is used in:
Correct Answer: B
Explanation: KOH is the electrolyte in nickel-cadmium (Ni-Cd) rechargeable cells.
3 In the reaction 2Fe + 3Cl₂ → 2FeCl₃:
Correct Answer: B
Explanation: Fe (0 → +3) is oxidized; Cl₂ (0 → -1) is reduced.
4 Cu metal can be purified in electrolytic cell by making impure Cu as:
Correct Answer: A
Explanation: In electrolytic refining, impure Cu is oxidized at anode while pure Cu deposits at cathode.
5 Loss of electrons is called:
Correct Answer: A
Explanation: Oxidation involves loss of electrons (OIL RIG: Oxidation Is Loss).
6 Fuel cells convert chemical energy into:
Correct Answer: C
Explanation: Fuel cells directly convert chemical energy to electrical energy.
7 Electrolysis is used for:
Correct Answer: D
Explanation: All are industrial applications of electrolysis.
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