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Zn is more electropositive than Fe. Therefore, it should get corroded faster than Fe. But it does not happen. Instead, it is used to galvanize iron. Explain why does it happen so?

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Though zinc is more reactive than iron but when a layer of zinc is exposed to the atmosphere zinc reacts with the oxygen in the atmosphere to form zinc oxide. This zinc oxide forms a protective layer on the surface of zinc which prevents the further attack. Hence zinc is used to galvanize iron.

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