First slide

Electrolysis

Question

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

Moderate

A

pH of solution increases
B

Oxygen is liberated at cathode
C

Blue colour intensity decreases during electrolysis
D

Blue colour intensity remains constant during electrolysis

Solution

$Anode 2 H_{2} O (l) ⟶ 4 H^{+} (aq .) + O_{2} (g) + 4 e^{-} Cathode {Cu}^{+ 2} + 2 e^{-} ⇌ Cu (s)$
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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