Assertion :Aqueous solution of $C u S O_{4}$ turns colourless on complete electrolysis using platinum electrode. Reason: $C u S O_{4}$ is converted into $C u (O H)_{2}$ on electrolysis.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
During electrolysis of copper,
$C u^{2 +}, S O_{4}^{2 -}, O H^{-} a n d H^{+}$ ions are present
at anode: $4 O H^{-} \to 2 H_{2} O + O_{2} + 4 e^{-}$
at cathode $C u^{2 +} + 2 e^{-} \to C u$
Net cell reaction $2 C u (O H)_{2} \to 2 H_{2} O + 2 C u + O_{2}$

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