JEE Main 2024 — Solutions Question with Solution
From: JEE Main 2024 (Online) 27th January Morning Shift
Question
A solution of two miscible liquids showing negative deviation from Raoult's law will have :
Choose an option
Show full solutionCorrect option: D
Correct answer
Ddecreased vapour pressure, increased boiling point
Step-by-step explanation
Negative Deviation from Raoult's Law
Effect on Vapor Pressure and Boiling Point
Answer
- Negative deviation means the intermolecular forces of attraction between the molecules of the two liquids (A-B) are stronger than the forces between molecules of the pure liquids (A-A and B-B).
- This stronger attraction makes it harder for molecules to escape into the vapor phase.
Effect on Vapor Pressure and Boiling Point
- Vapor Pressure : Since the molecules are held more tightly, the vapor pressure of the solution will be lower than expected from Raoult's law. Decreased vapor pressure.
- Boiling Point : A lower vapor pressure means you need to increase the temperature further to reach atmospheric pressure, where boiling occurs. Therefore, the boiling point of the solution will be higher than expected. Increased boiling point.
Answer
The correct answer is Option D: decreased vapor pressure, increased boiling point.
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This is a previous-year question from JEE Main 2024, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.