When the sample of copper with zinc impurityn is to be purified by electrolysis, the appropriate electrode are .

Options

A. pure zinc as cathode and pure copper as anode
B. impure sample as cathode and pure copper as anode
C. impure sample as cathode and pure copper as anode
D. pure copper as cathode and impure sample as anode

Answer

D

Explanation

Impure Cu will oxidise from anode along with Zn but only `Cu^(2+)` will reduce on cathode in purifecation of `Cu^(2+)`.