NEET Chemistry (general) MCQ Question
Which of the following statements regarding the vapor pressure of solutions is correct?
The partial vapor pressure of each component is proportional to its mole fraction in the solution.
The total vapor pressure is equal to the sum of the vapor pressures of the pure components only.
The vapor pressure of a solution increases with the addition of a non-volatile solute.
The relative lowering of vapor pressure is equal to the mole fraction of the solvent in the solution.
Correct Answer
Detailed Explanation
Statement A is correct as it reflects Raoult's law, which states that the partial vapor pressure is directly proportional to the mole fraction of each component. Statement B is incorrect because the total vapor pressure includes the contributions from all components. Statement C is false as the addition of a non-volatile solute decreases the vapor pressure. Statement D is incorrect since the relative lowering of vapor pressure is equal to the mole fraction of the solute, not the solvent.
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