JEE Chemistry
Raoult's Law & Vapour Pressure: JEE Questions & Solutions
19 previous-year JEE Chemistry questions on Raoult's Law & Vapour Pressure, each with a worked step-by-step solution.
Previous-year questions
- 01Given below are two statements: Statement I: The Henry’s law constant K_H is constant with respect to variations in solution concentration…MCQEasyJEE 2026
- 02Consider a solution of CO₂(g) dissolved in water in a closed container. Which one of the following plots correctly represents the variation…MCQEasyJEE 2026
- 03Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone…MCQEasyJEE 2026
- 04Two liquids A and B form an ideal solution. At 320 K, the vapour pressure of the solution, containing 3 mol of A and 1 mol of B is 500 mm…NVAMediumJEE 2026
- 05Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and pure B are 55 kPa and 15 kPa…MCQMediumJEE 2026
- 06At 298 K, the mole percentage of N₂(g) in air is 80%. Water is in equilibrium with air at a pressure of 10 atm. What is the mole fraction…MCQEasyJEE 2026
- 07At temperature T K, 2 moles of liquid A and 3 moles of liquid B are mixed. The vapour pressure of the ideal solution formed is 320 mm Hg.…MCQMediumJEE 2026
- 08When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm Hg. The mole fraction of the…MCQEasyJEE 2025
- 09Consider a binary solution of two volatile liquid components 1 and 2. x₁ and y₁ are the mole fractions of component 1 in the liquid and…MCQMediumJEE 2025
- 10A solution is made by mixing one mole of volatile liquid A with 3 moles of volatile liquid B. The vapor pressure of pure A is 200 mm Hg and…MCQEasyJEE 2025
- 11Liquid A and B form an ideal solution. The vapour pressure of pure liquids A and B are 350 mm Hg and 750 mm Hg respectively at the same…MCQEasyJEE 2025
- 12Match List-I with List-II | List-I | List-II | | --- | --- | | (A) Solution of chloroform and acetone | (I) Minimum boiling azeotrope | |…MCQMediumJEE 2025
- 13Which of the following binary mixture does not show the behavior of minimum boiling azeotropes?MCQEasyJEE 2025
- 14A solution of two miscible liquids showing negative deviation from Raoult’s law will have:MCQEasyJEE 2024
- 15The vapor pressure of pure benzene and methyl benzene at 27 °C is given as 80 Torr and 24 Torr, respectively. The mole fraction of methyl…NVAEasyJEE 2024
- 16The total pressure observed by mixing two liquids A and B is 350 mm Hg when their mole fractions are 0.7 and 0.3 respectively. The total…NVAMediumJEE 2023
- 17The vapour pressure versus temperature curve for a solution-solvent system is shown below. The boiling point of the solvent is ^°C.NVAEasyJEE 2023
- 18What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0.20 mmHg? (Assume dilute solution is being…MCQEasyJEE 2023
- 19The vapour pressure of 30% (w/v) aqueous solution of glucose is mm Hg at 25^°C. [Given: The density of 30% (w/v) aqueous solution of…NVAMediumJEE 2023
Frequently asked questions
Our bank has 19 previous-year JEE Chemistry questions tagged to Raoult's Law & Vapour Pressure, drawn from JEE papers between 2023 and 2026, including 7 from 2026 alone. Each comes with a full step-by-step solution.
Raoult's Law & Vapour Pressure is rated Intermediate overall for JEE Chemistry. The PYQs on this page break down as 12 easy, 7 medium.
Of the 19 previous-year questions on Raoult's Law & Vapour Pressure, 14 are multiple-choice (MCQ) and 5 are numerical-value (NVA) questions.
Based on recent paper analysis, Raoult's Law & Vapour Pressure is worth about 1 mark in JEE Main. It sits in Solutions, a Class 12 Chemistry chapter.
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