Question

Give reason for the following: 1. the blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes. 2. Carbonic acid gives an acid salt but hydrochloric acid does not.
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Answer 1

Answer:

It is because, the blue colour of electrolyte is due to the presence of Cu2+ ions. As Cu2+ ions discharge at cathode, therefore their concentration in electrolyte decreases. Thus, gradually blue colour fades away.