2. What happens to metals on heating:

They expand

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They contract

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They remain unaffected

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None of these

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Solution

The correct option is A
They expand

Explanation:
Metals are good conductors of heat and electricity.
When metals are heated, the kinetic energy of the particles of metals increases and they start moving randomly.
As a result, metal undergoes thermal expansion.
Hence, option (A) is the correct answer. On heating, metal expands.

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