When `CuSO_(4)` is electrolysed, using Pt electrodes

Options

A. Copper is liberated at cathode, sulphur at anode
B. Copper is liberated at cathode, oxygen at anode
C. Sulphur is liberated at cathode, oxygen at anode
D. Oxygen is liberated at cathode, copper at anode.

Answer

B

Explanation

During electrolyses, copper is deposited at the cathode while oxygen is liberated at anode. The following reactions occur at the electrodes.
At anode `2H_(2)O to 4H^(+) + O_(2) + 4e^(-)`(Oxidation)
At cathode `Cu^(2+) + 2e^(-) to Cu(s)` (Reduction)