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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$(B)$ an aqueous solution of $AgNO_3$ using platinum electrodes.
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$(D)$ a high concentration solution of $H_2 SO_4$ using platinum electrodes.
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