Learn

Friday, 9 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 29 June 2022, Shift 1, Chemistry Q83

Question 83 of 90 in this shift, Chemistry question 23 of 30, Section B.

1.2 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 is 0.0198∘C0.0198^\circ\mathrm{C}. The percentage of dissociation of the acid is ____________. (Nearest integer) [Given : Density of acetic acid is 1.02 g mL−11.02\ \mathrm{g\ mL^{-1}} Molar mass of acetic acid is 60 g mol−160\ \mathrm{g\ mol^{-1}} Kf(H2O)=1.85 K kg mol−1K_f(\mathrm{H_2O}) = 1.85\ \mathrm{K\ kg\ mol^{-1}}]

Official answer

5

NTA final key (2022 Session 1).

Chapter
Solutions
Topic
Colligative Properties
Idea tested
Calculating Ka from Freezing Point Depression

Same idea in other shifts

Asked 3× in all
  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

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 42 of the 174 JEE Main shifts held from 2017 to 2026.