Iron may be protected from rusting by coating with zinc or tin. Explain why zinc protects iron more effectively than tin once the protection coating has been seratched, using the data given, `Zn^2++2 e^- Zn,-0.76 ~V` `Fe^2++2 e^4 Fe,-0.44 ~V` `Sn^2 *+2 e^- S n,-0.14 ~V`

Explanation

An element with higher oxidation potential will undergo oxidation easily. The oxidatión po¿tentials of zinc, iron and,tin are `+0.76,+0,44` and `+0.14 ~V` respectively. Thus of the three, zinc.has the highest oxidation potential than iron followed by tin. Thus zinc will undergo oxidation more easily when compared to iron or tin. Hence zinc .protects iron more effectively than tin.