Question

The blue colour of aq. copper sulphate does not change when it is electrolysed using copper electrodes. 

Answer 1

For every copper ion (Cu²⁺ ) discharged at the cathode as neutral copper atom (Cu), a copper ion (Cu²⁺ ) is released or added to the solution at the anode and hence the total number of Cu²⁺ ions remains the same. Therefore the blue colour of CuSO does not fade in electrolytic reaction.