A galvanic cell has the overall reaction:
Zn(s) + 2Eu(NO3)3(aq) → Zn(NO3)2(aq) + 2Eu(NO3)2(aq)
Which is the half reaction occurring at the anode?
◦ NO3-(aq) + 4H+(aq) + 3e-→ NO(g) + 2H2O(l)
◦ NO2(g) + H2O(l) → NO3-(aq) + 2H+(aq) + e-
◦ Zn(s) → Zn2+(aq) + 2e-
◦ Eu3+(aq) + e-→ Eu2+
◦ Zn(s) + 2e-→ Zn2+(aq)-