(C) The correct answer is $C$. In the electrochemical cell representation $Zn | Zn^{2+} || Cu^{2+} | Cu$,the left side represents the anode (negative

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(C) The correct answer is $C$. In the electrochemical cell representation $Zn | Zn^{2+} || Cu^{2+} | Cu$,the left side represents the anode (negative electrode) and the right side represents the cathode (positive electrode). Therefore,$Zn$ acts as the negative electrode where oxidation occurs $(Zn \rightarrow Zn^{2+} + 2e^-)$.