Which of the following is $NOT$ an anode reaction?

  • A
    $Cl^{-} \to \frac{1}{2}Cl_{2} + e^{-}$
  • B
    $Cu \to Cu^{2+} + 2e^{-}$
  • C
    $Hg^{+} \to Hg^{2+} + e^{-}$
  • D
    $Zn^{2+} + 2e^{-} \to Zn$

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