JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 28 June 2022, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is

\frac{x}{17}

. The value of x is ________.

Official answer

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Relative Lowering of VP

Same idea in other shifts

Asked 12× in all

6 Apr 2026, Shift 1 · Q56When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was $x$ % of…EasySingle correct
2 Apr 2025, Shift 1 · Q55A solution is made by mixing one mole of volatile liquid A with 3 moles of volatile liquid B. The vapour pressure of pure A is 200 mm Hg…MediumSingle correct
7 Apr 2025, Shift 2 · Q55Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the same…MediumSingle correct
9 Apr 2024, Shift 2 · Q84The vapor pressure of pure benzene and methyl benzene at $27^\circ$ C is given as 80 Torr and 24 Torr, respectively. The mole fraction of…MediumNumerical value
6 Apr 2023, Shift 1 · Q85Mass of Urea ( $\mathrm{NH_2CONH_2}$ ) required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is…MediumNumerical value
11 Apr 2023, Shift 2 · Q62What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0.20 mm Hg ? (Assume dilute solution is being…MediumSingle correct
15 Apr 2023, Shift 1 · Q83The vapour pressure of 30% (w/v) aqueous solution of glucose is __________ mm Hg at $25^\circ\mathrm{C}$ . [Given : The density of 30%…MediumNumerical value
26 Feb 2021, Shift 1 · Q54224 mL of $\mathrm{SO_{2(g)}}$ at 298 K and 1 atm is passed through 100 mL of 0.1 M NaOH solution. The non-volatile solute produced is…HardNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.