Q50 / 159 · NTA Abhyas (NEET) 2020 · Chemistry · d and f Block Elements

When $C u S O_{4}$ is electrolysed using platinum electrodes,

A
copper is liberated at cathode, sulphur at anode
Correct answer
B
copper is liberated at cathode, oxygen at anode
C
sulphur is liberated at cathode, oxygen at anode
D
oxygen is liberated at cathode, copper at anode

Solution

{CuSO}_{4} ⇌ {Cu}^{2 +} + {SO}_{4}^{2 -}

H_{2} O ⇌ H^{+} + {OH}^{-}

At cathode:

C u^{2 +} + 2 e^{-} \to C u

At anode:

4 O H^{-} \to 2 H_{2} O + O_{2} + 4 e^{-}

Hence, the correct answer is option: 'B'.

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