Solution:
Option (a) is the answer. The impure metal is deposited in the anode mud. But the pure metal is deposited on the cathode and anode mud contains contaminants.
During the refining of an impure metal by electrolysis, the pure metal is deposited: (a) At the cathode (b) On the walls of the electrolytic tank (c) At the anode (d) At the bottom of the electrolytic tank
During the refining of an impure metal by electrolysis, the pure metal is deposited: (a) At the cathode (b) On the walls of the electrolytic tank (c) At the anode (d) At the bottom of the electrolytic tank