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Question

Rusting of iron is a chemical change because:

A

it is temporary

B

it can be cleaned and the original substance recovered

C

it is a slow reaction

D

a new substance is formed

Medium

Solution

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Correct option is
D

a new substance is formed

A change in which one or more new substances are formed is known as chemical change.
When the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but iron oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

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