(i) During this electrolysis reaction, copper metal is deposited at cathode and oxygen gas is liberated at anode.
(ii) In the electrolyte, the blue colour of copper sulphate becomes paler due to the formation of sulphuric acid.
(iii) Reaction at cathode: The ions migrating to cathode would be and ions. But the ion that is preferentially discharged at cathode is as it is positioned lower than ion in the electrochemical series, forming copper atoms at platinum cathode.
Reaction at anode: Similarly, ions migrating to anode would be , . But the ion that is preferentially discharged at anode is , as it is positioned lower than in the electrochemical series, producing neutral OH particles that react by itself to form water and oxygen. Oxygen gas is liberated at carbon anode.