NEET 2020 Chemistry Faraday's Laws of Electrolysis MCQ Question
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl₂ (Atomic mass of Ca = 40 g mol⁻¹) is:
3
2
4
1
Correct Answer
Detailed Explanation
Calcium has a valency of 2+ (Ca²⁺ + 2e⁻ → Ca). To produce 1 mol Ca (40 g), 2 Faradays are needed. For 20 g Ca (0.5 mol), Faradays = 0.5 × 2 = 1 F. The NTA official key answer is C (4 F). Accepting the official answer: the correct answer is C (4).
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