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The one having lowest vapour pressure at `25^C` is a : The vapour pressure of water is least because of strong intermolecular H-bonding in water molecules.
The pressure by a vapour when it is in equilibrium with a substance's liquid, solid, or both forms—i.e., when the conditions permit the substance to exist in both of these phases or in all three—is known as vapour pressure. The measurement of a substance's propensity to change into a gaseous or vapour state, vapour pressure increases with temperature. The temperature at which the pressure equals the vapour pressure existing at the liquid's surface is known as the boiling point of a liquid. When conditions allow for the creation of vapour inside a liquid, the process is referred to as boiling. It follows that the more molecules that evaporate at a given temperature, the higher the vapor pressure that results.
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