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Saturday, 31 October

JEE Main · Chemistry · Solutions

Degree of Association from Van't Hoff Factor

JEE Main asked Degree of Association from Van't Hoff Factor 4 times in 4 of the 108 shifts Lumi analysed, in 2017, 2021 and 2022. It belongs to Colligative Properties, in Solutions (Chemistry). The longest wait between two years asking it was 4 years, across 2018 and 2019, which Lumi has no shifts for. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2017
last in 2022
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

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

00.510.83’170’200.07’210.03’220’230’240’250’26

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

Shift by shift

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

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20212 of 24
  • 20200 of 12
  • 20171 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.

  • Percentage association from freezing point depression
  • Percentage association from boiling point elevation

Difficulty

Easy 0Medium 4Hard 0

2 of the 4 questions had a numerical answer.

Every question

All 4 questions

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

  1. 25 Jun 2022, Shift 2 · Q63Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2 °C. The…MediumSingle correct
  2. 18 Mar 2021, Shift 2 · Q54A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52℃. The percentage association of A is __________.…MediumNumerical value
  3. 26 Feb 2021, Shift 2 · Q55When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be −0.93∘-0.93^\circC…MediumNumerical value
  4. 2 Apr 2017 (offline) · Q37The freezing point of benzene decreases by 0.45°C when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form…MediumSingle correct

Shifts: 2 Apr 2017 (offline), 26 Feb 2021, Shift 2, 18 Mar 2021, Shift 2, 25 Jun 2022, Shift 2.

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