Chemistry

Problem

The table lists standard reduction potentials at 298 K. I. Ag⁺ + e⁻ → Ag

E^{\circ}=+0.80\,\text{V}

II. Cu²⁺ + 2 e⁻ → Cu

E^{\circ}=+0.34\,\text{V}

III. Zn²⁺ + 2 e⁻ → Zn

E^{\circ}=-0.76\,\text{V}

IV. Fe³⁺ + e⁻ → Fe²⁺

E^{\circ}=+0.77\,\text{V}

Which overall reaction, written under standard conditions, will generate the greatest positive cell potential? a)

Fe^{3+} + Zn \rightarrow Fe^{2+} + Zn^{2+}

Cu^{2+} + Ag \rightarrow Cu + Ag^{+}

Ag^{+} + Zn \rightarrow Ag + Zn^{2+}

Cu^{2+} + Zn \rightarrow Cu + Zn^{2+}