The standard reduction potential \(E^{\circ}\) for half reactions are,
\(\mathrm{Zn}\longrightarrow \mathrm{Zn}^{2+} + 2e^{-}; E^{\circ} = +0.76\mathrm{V}\)
\(\mathrm{Fe}^{2+} + 2e^{-}\longrightarrow \mathrm{Fe}; E^{\circ} = +0.41\mathrm{V}\)
The emf of the cell reaction \(\mathrm{Fe}^{2+} + \mathrm{Zn}\longrightarrow \mathrm{Zn}^{2+} + \mathrm{Fe}\) is