A galvanic cell has the overall reaction:
2Fe(NO3)2(aq) + Pb(NO3)2(aq) → 2Fe(NO3)3(aq) + Pb(s)
Which is the half reaction occurring at the cathode?
◦ NO3-(aq) + 4H+(aq) + 3e-→ NO(g) + 2H2O(l)
◦ NO3-(aq) + 2H+(aq) + e-→ NO2(g) + H2O(l)
◦ Fe2+(aq) → Fe3+(aq) + e-
◦ Pb2+(aq) + 2e-→ Pb(s)
◦ Fe2+(aq) + e-→ Fe3+(aq)