Electrode potentials and electrochemical cells (A-level only)

Which change to an $Fe3+(aq)/Fe2+(aq)\text{Fe}^{3+}(\text{aq}) / \text{Fe}^{2+}(\text{aq})$ electrode has no effect on the electrode potential?

The concentration of $Fe2+(aq)\text{Fe}^{2+}(\text{aq})$ ions

The concentration of $Fe3+(aq)\text{Fe}^{3+}(\text{aq})$ ions

The surface area of the platinum electrode

The temperature of the system

Which change to an $Fe3+(aq)/Fe2+(aq)\text{Fe}^{3+}(\text{aq}) / \text{Fe}^{2+}(\text{aq})$ electrode has no effect on the electrode potential?

The concentration of $Fe2+(aq)\text{Fe}^{2+}(\text{aq})$ ions

The concentration of $Fe3+(aq)\text{Fe}^{3+}(\text{aq})$ ions

The surface area of the platinum electrode

The temperature of the system

Electrode potentials and electrochemical cells (A-level only) Questions