Which half-reaction from the notes is an example of reduction?
A$Zn \rightarrow Zn^{2+} + 2e^-$
B$Cu \rightarrow Cu^{2+} + 2e^-$
C$Cu^{2+} + 2e^- \rightarrow Cu$
D$Zn^{2+} \rightarrow Zn + 2e^-$
Answer & Solution
Correct answer: C. $Cu^{2+} + 2e^- \rightarrow Cu$
Reduction involves gain of electrons. In $Cu^{2+} + 2e^- \rightarrow Cu$, copper ions gain electrons to form copper metal, so this is the reduction half-reaction.
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