In the galvanic cell description, which process is correctly identified as oxidation at the zinc electrode?
A$Zn^{2+} + 2e^- \rightarrow Zn$
B$Zn \rightarrow Zn^{2+} + 2e^-$
C$Cu^{2+} + 2e^- \rightarrow Cu$
D$SO_4^{2-} \rightarrow SO_4 + 2e^-$
Answer & Solution
Correct answer: B. $Zn \rightarrow Zn^{2+} + 2e^-$
Oxidation is loss of electrons or increase in oxidation number. At the zinc electrode, zinc metal loses two electrons to form $Zn^{2+}$, so $Zn \rightarrow Zn^{2+} + 2e^-$ is the oxidation half-reaction.
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