Learn

Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 29 June 2022, Shift 2, Chemistry Q65

Question 65 of 90 in this shift, Chemistry question 5 of 30, Section A.

A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is [Given: Molar mass : Na = 23.0 g mol−1\mathrm{mol^{-1}} ; Cl = 35.5 g mol−1\mathrm{mol^{-1}}]
  1. (1)36 mmol L−1\mathrm{mmol\ L^{-1}}
  2. (2)36 mol L−1\mathrm{mol\ L^{-1}}
  3. (3)1440 mol L−1\mathrm{mol\ L^{-1}}
  4. (4)1440 mmol L−1\mathrm{mmol\ L^{-1}}Official answer

Official answer

Option 4

NTA final key.

Chapter
Surface Chemistry
Topic
Colloids
Idea tested
Flocculation Value Calculation

Same idea in other shifts

Asked 2× in all
  1. 8 Apr 2023, Shift 2 · Q87Coagulating value of the electrolytes AlCl3\mathrm{AlCl_3} and NaCl for As2S3\mathrm{As_2S_3} are 0.09 and 50.04 respectively. The coagulating…EasyNumerical value

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