JEE Main Chemistry · Solutions

Relative Lowering of VP

Relative Lowering of VP (Solutions) was asked 7 times in 7 JEE Main shifts, 2020–2026, out of the 42 shifts Lumi analysed. 2 of the 7 had a numerical answer.

Times asked: 7; in 7 shifts
Years: 2020–2026
Usual format: Single correct; Calculation
Pattern: Asked most years; repeats across shifts

How it is asked

Vapour pressure from mole fraction
Vapour versus liquid composition of ideal solution

Difficulty

Easy 2Medium 5Hard 0

Where it sits

Chapter: Solutions. Topic: Colligative Properties, 36 questions over 16 ideas.

All 7 questions

Newest first, each with its options and official answer.

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
2 Sep 2020, Shift 1 · Q26An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of…MediumSingle correct
6 Sep 2020, Shift 2 · Q43A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and C. The relative…EasySingle correct