Zn2+(aq) + Fe(s) → Fe2+(aq) + Zn(s)
Seems fairly simple.. Not quite sure why I'm getting it wrong.
Oxidation numbers: 2+, 0, 2+, 0
Zinc is the reduction agent, it loses 2.
Iron is the oxidation, it gains 2.
So shouldn't the balanced equation be:
2Zn2+(aq) + 2Fe(s) → 2Fe2+(aq) + 2Zn(s)