When the vapour pressure of a liquid is equal to its atmospheric pressure, then it :

freezes

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evaporates

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boils

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does not undergo any change

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Solution

The correct option is B boils
A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it. The lower the pressure of a gas above a liquid, the lower the temperature at which the liquid will boil.

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When the vapour pressure of a liquid is equal to its atmospheric pressure, then it

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