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

Options

A. Cathode : Pure `Zn`
Anode : Pure` Cu`
B. Cthode : Impure sample
Anode : Pure `Cu`
C. Cathode : Impure `Zn`
Anode : Impure sample
D. Cathode : Pure `Cu`
Anode : Impure sample

Answer

D

Explanation

Anode : `Cu rarr Cu^(2+) + 2e^(Ө)` (impure)
Cathode : `Cu^(2+) + 2e^(Ө)` rarr Cu` (pure).