Question

Zinc is used to cover iron so as to prevent it from rusting

Answer 1

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

The statement, zinc is used to cover iron so as to prevent it from rusting, is true.

Explanation:

• A process in which a protective zinc coating is applied over a piece of steel or iron in order to prevent rusting is known as galvanization. This process is done in order to prevent the surface of iron from directly getting exposed to air.

• As direct exposure of iron without any zinc coating will lead to the formation of an oxide layer on its surface. As a result, rust will deposit on the surface. The reaction equation is as follows.

                $4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}$

• Therefore, when zinc applied on the surface of iron then there will no formation of oxide layer on the surface of iron. Hence, no formation of rust will be there.

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