The vapour of a substance behaves as a gas:

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(B) The critical temperature is defined as the temperature above which a gas cannot be liquefied by pressure alone.Below the critical temperature,a su

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Above critical temperature

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(B) The critical temperature is defined as the temperature above which a gas cannot be liquefied by pressure alone.Below the critical temperature,a substance in the gaseous state is called a vapour,as it can be liquefied by increasing the pressure.Above the critical temperature,the substance exists in a state where it cannot be liquefied regardless of the pressure applied,and it behaves as a gas.Therefore,option $(B)$ is correct.

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