Which half-reaction is most easily oxidized?
Al3+ + 3e- Al = -1.66 V
Cu2+ + 2e- Cu = 0.34 V
Fe3+ + e- Fe2+ = 0.77 V
Na+ + e- Na = -2.71 V
Pb2+ + 2e- Pb = -0.13 V
Al3+ + 3e- Al = -1.66 V
Cu2+ + 2e- Cu = 0.34 V
Fe3+ + e- Fe2+ = 0.77 V
Na+ + e- Na = -2.71 V
Pb2+ + 2e- Pb = -0.13 V
Answer: