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Electrolysis and Electrolytes

Which substan...

Question

Which substance is obtained in the solution on electrolysis of aqueous $C u S O_{4}$ solution suing graphite electrode?

H_{2} O

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H_{2} S O_{4}

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N a_{2} S O_{4}

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C u (O H)_{2}

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Solution

The correct option is B $H_{2} O$
At anode:
$2 H_{2} O (l) \to O_{2} (g) + 4 H^{+} (a q) + 4 e^{-}$
At cathode:
$2 C u^{2 +} (a q) + 4 e^{-} \to 2 C u (s)$
Net electrolysis reaction is
$2 C u^{2} (a q) + 2 H_{2} O (l) \to 2 C u (s) + 4 H^{+} (a q) + O_{2} (g)$ .

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(P t)

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C u S O_{4} (a q)

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