Electrochemistry | Past Year Paper Chemistry MCQs | mosaicbro.com

Electrochemistry | Past Year Paper Chemistry MCQs

7 of 29 questions (Page 4 of 5)

Filter by Category

22 According to classical concept, oxidation involves:
Correct Answer: D
Explanation: Classically, oxidation includes all these definitions.
23 In Na₂O₂, the oxidation state of oxygen is:
Correct Answer: C
Explanation: Peroxides contain O₂²⁻ with O in -1 state.
24 Extraction of Na by electrolysis of fused NaCl uses:
Correct Answer: A
Explanation: Down's cell electrolyzes molten NaCl to produce Na metal.
25 When metal is deposited on another by electric current, it's called:
Correct Answer: C
Explanation: Definition of electroplating.
26 Sulphur has highest oxidation state in:
Correct Answer: B
Explanation: S has +6 in SO₃ (highest among options).
27 The cell converting electrical to chemical energy is:
Correct Answer: B
Explanation: Electrolytic cells use electricity to drive non-spontaneous reactions.
28 In rusting (4Fe + 3O₂ → 2Fe₂O₃), iron is:
Correct Answer: D
Explanation: Fe (0 → +3) is oxidized in rusting.
MCQs Bank by mosaicbro.com