Food cans are coated with tin and not zinc because
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Food cans are coated with tin and not with zinc because zinc is above the tin in reactivity series means more reactive than tin and can react with food elements preserved in it.
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zinc has a higher melting point than tin.
Zinc is more reactive than iron, so it also acts as a sacrificial metal. ... The inside of a steel food can is electroplated with tin, a less reactive metal than iron. It provides a physical barrier to oxygen and water, stopping the can rusting.
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