Question

When the sample of copper wth zinc impurity is to be purified by electrolysis, the appropriate electrodes are

cathode	anode
(a) pure zinc	pure copper
(b) impure sample	pure copper
(c) impure zinc	impure sample
(d) pure copper	impure sample.

 

Answer 1

(d) : The impure metal is made anode while a thin sheet of pure metal acts as cathode. On passing the current, the pure metal is deposited on the cathode and equivalent amount of the metal gets dissolved from the anode.