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Which half-reaction equation represents the reduction of an iron(II) ion?$\newline$($1$) $\mathrm{Fe}^{2+} \longrightarrow \mathrm{Fe}^{3+}+\mathrm{e}^{-}$$\newline$($3$) $\mathrm{Fe}^{3+}+\mathrm{e}^{-} \longrightarrow \mathrm{Fe}^{2+}$$\newline$($2$) $\mathrm{Fe}^{2+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Fe}$$\newline$($4$) $\mathrm{Fe} \longrightarrow \mathrm{Fe}^{2+}+2 \mathrm{e}^{-}$$\newline$$1$$\newline$$2$$\newline$$3$$\newline$$4$$\newline$Clear selection