Vapour pressure of three liquids A, B, C are in their ascending order. Identify the liquid that has least critical temperature in its gaseous state.

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Solution

The temperature at and above which a substance cannot be liqueified no matter however high the applied pressure may be is known as the critical temperature. A liquid having the least vapor pressure will have the highest boiling point and hence the least critical temperature. Hence the vapor pressure is directly proportional to the critical temperature and this gives A having the least critical temperature in the gaseous state

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