NEET Chemistry Colligative Properties Assertion Reason Question
Assertion (A): The presence of a non-volatile solute in a solution leads to a lowering of the vapour pressure of the solvent. | Reason (R): The relative lowering of vapour pressure is directly proportional to the mole fraction of the solute in the solution.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false.
Correct Answer
Detailed Explanation
The presence of a non-volatile solute lowers the vapour pressure of the solvent, and this effect is quantifiable through Raoult's law, which states that the relative lowering of vapour pressure is proportional to the mole fraction of the solute.
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