Consider the half-reactions:

Question

Cu^2+(aq) +2e^- ==> Cu(s) E naught = +0.34V

Sn^2+(aq) + 2e^- ==> Sn E naught = -0.14V

Fe^2+ + 2e^- ==> Fe(s) E naught = -0.44V

Al^3+(aq) = 3e^- ==> Al(s) E naught = -1.66V

Mg^2+(aq) = 2e^- ==> Mg(s) E naught = -2.37V

Which metals or metal ions will reduce Fe^2+(aq)?

Answer 1

The ion or metal with which you can obtain a + voltage when combined with the Fe^+2 + 2e ==> Fe(s)

Answer 2

Al and Mg