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A metal cap of a bottle opens easily on immersing it in a bowl of hot water because of

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a

Expansion

b

Contraction

c

Evaporation

d

Condensation

answer is A.

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Detailed Solution

A metal cap of a bottle opens easily by immersing it in a bowl of hot water because of expansion.
The objects expand on heating and contract on cooling. Expansion and contraction are physical changes and not chemical changes. For example, when the metal cap is immersed in the bowl of hot water, then the metal cap expands and loosens a little. This makes it easy for the cap to be opened.

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