A substance will be deliquescent if its vapour pressure is:

greater than that of water vapour in air

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less than that of water vapour in air

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equal to that of water vapour in air

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equal to the atmospheric pressure

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Solution

The correct option is B less than that of water vapour in air
Deliquescence is the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution.
Deliquescence occurs when the vapor pressure of the solution that is formed is less than the partial pressure of water vapor in air.
So, option $B$ is correct

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