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Q.

On heating, metals


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a

Expands

b

Contracts

c

First expands and then contracts

d

First contracts and then expands 

answer is A.

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Detailed Solution

Metals expands on heating.
When heated, metal expands. Temperature causes an increase in length, surface area, and volume. Thermal expansion is the scientific term for this. The kinetic energy of a material's atoms causes it to expand (or contract). When a material is heated, the increase in energy causes the atoms and molecules to move faster and take up more space, causing the material to expand.
 
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