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Saturday, 31 October

JEE Main · Chemistry · Solutions

Relative Lowering of VP

JEE Main asked Relative Lowering of VP 12 times in 12 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. It belongs to Colligative Properties, in Solutions (Chemistry). The longest wait between two years asking it was 1 year. In 2020, 2023 and 2025 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
12
in 12 shifts
Years
7 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.150.30’170.25’200.03’210.03’220.21’230.05’240.25’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 3 in 12 shifts · 2024: 1 in 18 shifts · 2025: 2 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20252 of 8
  • 20241 of 18
  • 20233 of 12
  • 20221 of 24
  • 20211 of 24
  • 20203 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

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

Difficulty

Easy 2Medium 9Hard 1

6 of the 12 questions had a numerical answer.

Every question

All 12 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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 xx % of…EasySingle correct
  2. 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
  3. 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
  4. 9 Apr 2024, Shift 2 · Q84The vapor pressure of pure benzene and methyl benzene at 27∘27^\circC is given as 80 Torr and 24 Torr, respectively. The mole fraction of…MediumNumerical value
  5. 15 Apr 2023, Shift 1 · Q83The vapour pressure of 30% (w/v) aqueous solution of glucose is __________ mm Hg at 25∘C25^\circ\mathrm{C}. [Given : The density of 30%…MediumNumerical value
  6. 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
  7. 6 Apr 2023, Shift 1 · Q85Mass of Urea (NH2CONH2\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
  8. 28 Jun 2022, Shift 1 · Q85The 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…MediumNumerical value
  9. 26 Feb 2021, Shift 1 · Q54224 mL of SO2(g)\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
  10. 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
  11. 4 Sep 2020, Shift 1 · Q47At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same…MediumNumerical value
  12. 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

Shifts: 2 Sep 2020, Shift 1, 4 Sep 2020, Shift 1, 6 Sep 2020, Shift 2, 26 Feb 2021, Shift 1, 28 Jun 2022, Shift 1, 6 Apr 2023, Shift 1, 11 Apr 2023, Shift 2, 15 Apr 2023, Shift 1, 9 Apr 2024, Shift 2, 2 Apr 2025, Shift 1, 7 Apr 2025, Shift 2, 6 Apr 2026, Shift 1.

Same topic

Other ideas in Colligative Properties

Colligative Properties has 21 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas