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

Options

A. `{:("Cathode","Anode"),("Pure zinc","Pure copper"):}`
B. `{:("Cathode","Anode"),("Impure sample","Pure copper"):}`
C. `{:("Cathode","Anode"),("Impure zinc","Impure sample"):}`
D. `{:("Cathode","Anode"),("Pure copper","Impure sample"):}`

Answer

D

Explanation

Impure sample is made the anode and pure copper as the cathode.