Standard electrode potentials for a few half cells are mentioned below: E_Cu^2+ / Cu^°=0.34 V, E_Zn^2+ / Zn^°=-0.76 V; E_Ag^+ / Ag^°=0.80 V, E_Mg^2+…

Standard electrode potentials for a few half cells are mentioned below : $$\begin{aligned} & \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}, \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\circ}=-0.76 \mathrm{~V} \\ & \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=0.80 \mathrm{~V}, \mathrm{E}_{\mathrm{Mg}^{2+} / \mathrm{Mg}}^{\circ}=-2.37 \mathrm{~V} \end{aligned} $$ Which one of the following cells gives the most negative value of $\displaystyle \Delta \mathrm{G}^{\circ}$ ?