( begin array c Mg(s)+Ni^ 2+ (aq) rightarrow Mg^ 2+ (aq)+Ni(s) E^ circ _ Mg^ 2+ / Mg =-2.36 ~V, E_ Ni^ 2+ / Ni ^ circ =-0.25 ~V, E_ Cr^ 3+ / Cr ^ circ =-0.74 ~V end array )

\begin{array}{c}\mathrm{Mg}(\mathrm{s})+\mathrm{Ni}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Mg}^{2+}(\mathrm{aq})+\mathrm{Ni}(\mathrm{s}) \\ \mathrm{E}^{\circ}{ }_{\mathrm{Mg}^{2+} / \mathrm{Mg}}=-2.36 \mathrm{~V}, \mathrm{E}_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\circ}=-0.25 \mathrm{~V}, \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{~V}\end{array}

MCC 25

\begin{array}{c}\mathrm{Mg}(\mathrm{s})+\mathrm{Ni}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Mg}^{2+}(\mathrm{aq})+\mathrm{Ni}(\mathrm{s}) \\ \mathrm{E}^{\circ}{ }_{\mathrm{Mg}^{2+} / \mathrm{Mg}}=-2.36 \mathrm{~V}, \mathrm{E}_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\circ}=-0.25 \mathrm{~V}, \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{~V}\end{array}

MCC 25