Question

To deposit 0.634 g of copper by electrolysis of aqueous
cupric sulphate solution, the amount of electricity required
(in coulombs) is
(a) 1930 (b) 3960
(c) 4825 (d) 9650

Answer 1

The amount of electricity required is 1930 Coulomb.

Option (A) is correct.

Explanation:

• The quantity of electricity which can be deposited or liberated weight equal to equivalent weight is called one Faraday.      
• 1 Faraday = 96500 C
• Amount of copper to be deposit = 0.634 g
• Equivalent weight of copper = 63.54 / 2 = 31.77 g
• 1 of copper is deposited by = 96500 C x 0.634  / 31.7 =  1930 Coulomb.

Thus the amount of electricity required is 1930 Coulomb.

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