Question:
Raoult's law: vapour pressure of a solution is:
Raoult's law: vapour pressure of a solution is:
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More solvent = More vapour. Vapour pressure depends on the "Solvent" mole fraction.
Updated On: May 5, 2026
- Equal to vapour pressure of pure solvent
- Proportional to mole fraction of solvent
- Independent of temperature
- Proportional to mole fraction of solute
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Raoult's law states that the partial vapour pressure of each volatile component in an ideal solution is directly proportional to its mole fraction.
Step 2: Meaning
For a solution containing a non-volatile solute, the vapour pressure of the solution is determined solely by the solvent molecules at the surface.
Step 3: Analysis
Mathematically, $P_{solution} = P^{\circ}_{solvent} \times \chi_{solvent}$, where $P^{\circ}$ is the vapour pressure of the pure solvent and $\chi$ is the mole fraction.
Step 4: Conclusion
The equation shows that the vapour pressure of the solution is directly proportional to the mole fraction of the solvent. Final Answer: (B)
Raoult's law states that the partial vapour pressure of each volatile component in an ideal solution is directly proportional to its mole fraction.
Step 2: Meaning
For a solution containing a non-volatile solute, the vapour pressure of the solution is determined solely by the solvent molecules at the surface.
Step 3: Analysis
Mathematically, $P_{solution} = P^{\circ}_{solvent} \times \chi_{solvent}$, where $P^{\circ}$ is the vapour pressure of the pure solvent and $\chi$ is the mole fraction.
Step 4: Conclusion
The equation shows that the vapour pressure of the solution is directly proportional to the mole fraction of the solvent. Final Answer: (B)
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