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The number of Faradays (F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol⁻¹) is:

1. 2
2. 3
3. 4
4. 1

Correct answer: 1

Solution

Calcium (Ca) is produced by the reduction of Ca²⁺ ions, which requires 2 moles of electrons (2 Faradays) per mole of calcium. For 20 g of calcium (0.5 moles), the required Faradays are 0.5 × 2 = 1 F.

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