Scrap iron is added to a solution of $\mathrm{CuSO}{}_4$ obtained by acid leaching of a low-grade ore. Given $E^{\circ }(\mathrm{Cu}{}^{2+}/\mathrm{Cu})=+0.34\mathrm{V}$ and $E^{\circ }(\mathrm{Fe}{}^{2+}/\mathrm{Fe})=-0.44\mathrm{V}$, the standard cell potential of the displacement and the outcome are

1. A$E_{cell}^{\circ }=+0.78\mathrm{V}$; iron is deposited and copper dissolves
2. B$E_{cell}^{\circ }=+0.78\mathrm{V}$; copper is deposited and iron dissolves
3. C$E_{cell}^{\circ }=-0.78\mathrm{V}$; the reaction does not occur
4. D$E_{cell}^{\circ }=+0.10\mathrm{V}$; copper is deposited and iron dissolves