Which of the reactions occurs at anode when the electrolysis of ${CuCl}_{2}$ solution is carried out using platinum electrodes?

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$Cu \to {Cu}^{2 +} + 2 e^{-}$

$2 {Cl}^{-} \to {Cl}_{2} (g) + 2 e^{-}$

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

$2 Cu \to {Cu}_{2}^{2 +} + 2 e^{-}$

answer is B.

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Detailed Solution

${Cl}^{-}$ is oxidized in preference to $H_{2} O$ .

Electrolysis is the technique of causing a chemical change in a material by passing an electric current through it. The material either loses or gets an electron during the chemical transition (oxidation or reduction).

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