Q.

Which is correct statement about the electrolysis of aqueous solution of CuSO4 with copper cathode and Pt anode?

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pH of solution increases

Oxygen is liberated at cathode

Blue colour intensity decreases during electrolysis

Blue colour intensity remains constant during electrolysis

answer is C.

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Detailed Solution

Anode 2H2O(l)⟶4H+(aq.)+O2(g)+4e− Cathode Cu+2+2e-⇌Cu(s)As number of OH- ions decreases hence H+ increases so pH of solution decreases, Number of Cu2+ ions decreases so blue colour intensity decreases during electrolysis.

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