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Electrochemistry
Question
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Iron does not rust even if zinc coating is broken in galvanized iron pipe. Explain.

Answer

Answer:

Zinc is more reactive than iron, it loses electron more readily as compared to iron. In galvanized iron object, zinc acts as anode and does not allow the iron to lose electron, i.e. makes it a cathode. So long zinc is there on surface, it reduces to Fe2+ (if any formed) to iron back.

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