For the cell Zn ( s )| Zn^2+( aq ) ∥ M^x+( aq )| M ( s ), different half cells and their standard electrode potentials are given below: If E^° Zn^2+…

For the cell $\displaystyle \mathrm{Zn}(\mathrm{s})\left|\mathrm{Zn}^{2+}(\mathrm{aq}) \| \mathrm{M}^{x+}(\mathrm{aq})\right| \mathrm{M}(\mathrm{s})$, different half cells and their standard electrode potentials are given below :

$\displaystyle \mathrm{M}^{x+}(\mathrm{aq}) / \mathrm{M}(\mathrm{s})$	$\displaystyle \mathrm{Au}^{3+}(\mathrm{aq}) /$ $\displaystyle \mathrm{Au}(\mathrm{s})$	$\displaystyle \mathrm{Ag}^{+}(\mathrm{aq}) /$ Ag(s)	$\displaystyle \mathrm{Fe}^{3+}(\mathrm{aq}) /$ $\displaystyle \mathrm{Fe}^{2+}(\mathrm{aq})$	$\displaystyle \mathrm{Fe}^{2+}(\mathrm{aq}) /$ Fe(s)
$\displaystyle \mathrm{E}^{\circ}{ }_{\mathrm{M}^{x+} / \mathrm{M}}(\mathrm{V})$	$\displaystyle 1.40$	$\displaystyle 0.80$	$\displaystyle 0.77$	-$\displaystyle 0.44$

If $\displaystyle \mathrm{E}^{\circ} \mathrm{Zn}^{2+} / \mathrm{Zn}=-0.76 \mathrm{~V}$, which cathode will give a maximum value of $\displaystyle \mathrm{E}^{\circ}{ }_{\text {cell }}$ per electron transferred ?