Question

zinc is more reactive than iron.Then how is it possible that a layer of zinc can protect bridges from rusting.​

Answer 1

Answer:

Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object .

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Answer 2

Answer:

Zinc is more reactive than iron, so it oxidises in preference to the iron object.