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Iron may be protected from rusting by co...

Iron may be protected from rusting by coating with zinc or tin. By referring to the data given below, explain why zinc protect iron more effectively than tin?
`Zn^(2+) + 2e^(-) rarr Zn, E^(@) = - 0.76 V`
`Fe^(2+) + 2e^(-) rarr Fe, E^(@) = - 0.44V`
`Sn^(2+) + 2e^(-) rarr Sn , E^(@) = - 0.14V`

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