Q.

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

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answer is 4.

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Detailed Solution

CaCl2 →Ca+2+ 2Cl- Eq. weight = At.WtValency= 402=20gm 1 equivalent = 1×96500C = 1F

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