Question

Copper can be deposited from acidified copper sulphate and alkaline cuprous cyanide. If the same current is passed for a definite time :

• A. The amount of copper deposited from acidic copper sulphate will be higher.
• B. The amount of copper deposited from alkaline cuprous cyanide will be higher.
• C. The same amount of copper will be deposited.
• D. None of these

Answer 1

Answer: (B)

The amount of copper deposited from alkaline cuprous cyanide will be higher.

Alkaline solution will keep $H^{\oplus }$ low so that there is a very small concentration. Hence, chances of $H^{\oplus }$ getting reduced to $H_2$ along with Cu are lesser in alkaline cuprous cyanide as compared to acidified copper sulphate.