Question

Why is layer of zinc coated over iron?​

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.

Explanation:

main objective is to protect from rusting

hope it helps

Answer 2

A coating of zinc is deposited on iron bridges to protect it from corrosion and formation of rust.