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Question

A certain amount of current liberates 0.5 g of hydrogen in 2 hours. How many grams of copper can be produced by the same current flowing for the same time in copper sulphate solution?

A
31.8 g
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B
16.0 g
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C
12.7 g
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D
63.5 g
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Solution

The correct option is B 16.0 g
By Faradays second law of electrolysis,
If equal amount of charge (Q) is passed through two different solutions, the amount of substance deposited/liberated (W) is proportional to their chemical equivalent weights (E).

Thus,
W1W2=E1E2=Z1Z2

Weight of CuWeight of H2=Equivalent weight of CuEquivalent weight of H2

Weight of Cu0.504=63.5/22/2
Weight of Cu =16 g

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