Q.

Why rusting of iron is a chemical change?

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a

None

b

Because it makes iron powdery

c

Because it changes its colour

d

Because a new substance is formed

answer is C.

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Detailed Solution

Rusting is a chemical change because during rusting a new substance is formed.

4Fe + 3O2 + 6H2O4Fe(OH)3

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Why rusting of iron is a chemical change?