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Saturday, 31 October

JEE Main · Chemistry · Solutions

Calculating Ka from Freezing Point Depression

JEE Main asked Calculating Ka from Freezing Point Depression 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2022, 2025 and 2026. It belongs to Colligative Properties, in Solutions (Chemistry). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.03’210.03’220’230’240.13’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20211 of 24
  • 20200 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.

  • Ka of weak acid from freezing point depression
  • Percent dissociation from freezing point depression

Difficulty

Easy 0Medium 3Hard 1

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. 2 Apr 2026, Shift 1 · Q5519.519.5 g of fluoro acetic acid (molar mass =78 g mol−1=78\ \mathrm{g\ mol^{-1}}) is dissolved in 500500 g of water at 298298 K. The depression in the…MediumSingle correct
  2. 8 Apr 2025, Shift 2 · Q53HA(aq)⇌H+(aq)+A−(aq)\mathrm{HA(aq) \rightleftharpoons H^+(aq) + A^-(aq)} The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid…MediumSingle correct
  3. 29 Jun 2022, Shift 1 · Q831.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid…MediumNumerical value
  4. 24 Feb 2021, Shift 1 · Q55When 9.45 g of ClCH2COOH\mathrm{ClCH_2COOH} is added to 500 mL of water, its freezing point drops by 0.5∘C0.5^\circ\mathrm{C}. The dissociation…HardNumerical value

Shifts: 24 Feb 2021, Shift 1, 29 Jun 2022, Shift 1, 8 Apr 2025, Shift 2, 2 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