When iron is heated, it undergoes:

contraction in size

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no change

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expansion in size

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chemical reaction

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Solution

The correct option is C
expansion in size

Metals expand on heating.

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(d) expands first, then on cooling contracts and fits onto the wooden wheel

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When iron is heated, it undergoes:

The correct option is C expansion in size Metals expand on heating.

The correct option is C
expansion in size

Metals expand on heating.