Which one of the following reactions takes place at the anode when an aqueous solution of…

Chemistry · JEE Advanced · NTA Exams — Electrochemistry

Which one of the following reactions takes place at the anode when an aqueous solution of CuSO₄ is electrolysed using copper electrodes?

Cu → Cu²⁺ + 2e^–
\(\mathrm{SO}_{4}^{-} \rightarrow \mathrm{SO}_{2}+\mathrm{O}_{2}+2 \mathrm{e}^{-}\)
\(2 \mathrm{SO}_{4}^{2-}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{O}_{2}+4 \mathrm{e}^{-}\)
\(2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{+}+4 \mathrm{e}^{-}\)

Answer

(A) Cu → Cu 2+ + 2e –

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