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Question:

For a dilute solution, Raoult's law states that:
the relative lowering of vapour pressure is proportional to the amount of solute in solution
the relative lowering of vapour pressure is equal to the mole fraction of solute
the lowering of vapour pressure is equal to the mole fraction of the solute
the vapour pressure of the solution is equal to the mole fraction of solvent

the vapour pressure of the solution is equal to the mole fraction of solvent

the relative lowering of vapour pressure is equal to the mole fraction of solute

the lowering of vapour pressure is equal to the mole fraction of the solute

the relative lowering of vapour pressure is proportional to the amount of solute in solution

Solution:

According to Raoult's law, for dilute solutions containing non-volatile solute, the relative lowering of vapour pressure, Δp/p, is equal to the mole fraction of solute, X2. It is a colligative property. Hence, option B is correct.