Question

3 faraday of electricity are passed through molten Al₂O₃, aqueous solution of CuSO₄ and molten NaCl taken in three different electrolytic cells. The amount of Al, Cu and Na deposited at the cathodes will be in the ratio of –

• A. 1 mole : 2 mole : 3 mole
• B. 3 mole : 2 mole : 1 mole
• C. 1 mole : 1.5 mole : 3 mole
• D. 1.5 mole : 2 mole : 3 mole

Answer 1

Answer: (C)

1 mole : 1.5 mole : 3 mole

Answer 2

Equivalent of Al = Equivalent of Cu = Equivalent of Na

or $\frac{1}{3}$mole Al = $\frac{1}{2}$mole Cu = 1 mole Na

or 2 : 3 : 6 or 1 : 1.5 : 3 mole ratio