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Chemistry · Solutions and Colligative Properties

JEE Main 2026 — 22 January, Morning Shift — Question 55

Consider a solution of CO2( g)\mathrm{CO}_{2}(\mathrm{~g}) dissolved in water in a closed container.

Which one of the following plots correctly represents variation of log (partial pressure of CO2 in vapour phase above water) [y-axis] with log (mole fraction of CO2\mathrm{CO}_{2} in water) [ x -axis] at 25∘C25^{\circ} \mathrm{C} ?

  1. Option A:
    Option A figure
  2. Option B:
    Option B figure
    Correct
  3. Option C:
    Option C figure
  4. Option D:
    Option D figure

Answer: B

Step-by-step solution

From Henry's law :

P( g)=KH⋅X( g)logP⁡(g)=log⁡KH+log⁡X( g)\begin{aligned} & \mathrm{P}(\mathrm{~g})=\mathrm{K}_{\mathrm{H}} \cdot \mathrm{X}(\mathrm{~g}) & \operatorname{logP}(\mathrm{g})=\log \mathrm{K}_{\mathrm{H}}+\log \mathrm{X}(\mathrm{~g}) \end{aligned}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
22 January, Morning Shift
Subject
Chemistry
Chapter
Solutions and Colligative Properties
Topic
Gas in Liquid Solutions (Henry's Law)

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