Which chemical equation represents the standard reduction potential of zinc?
- A$Zn^{2+}_{(s)} + 2e^{-} \rightarrow Zn_{(s)}$
- B$Zn_{(g)} \rightarrow Zn^{2+}_{(g)} + 2e^{-}$
- C$Zn^{2+}_{(g)} + 2e^{-} \rightarrow Zn_{(s)}$
- D$Zn^{2+}_{(aq)} + 2e^{-} \rightarrow Zn_{(s)}$
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