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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 February 2021, Shift 2, Chemistry Q33

Question 33 of 90 in this shift, Chemistry question 3 of 30, Section A.

Which one of the following statements is FALSE for hydrophilic sols ?
  1. (1)They do not require electrolytes for stability.
  2. (2)These sols are reversible in nature.
  3. (3)Their viscosity is of the order of that of H2O\mathrm{H_2O}.Official answer
  4. (4)The sols cannot be easily coagulated.

Official answer

Option 3

NTA final key.

Chapter
Surface Chemistry
Topic
Colloids
Idea tested
Lyophilic and Lyophobic Sols

Same idea in other shifts

Asked 5× in all
  1. 13 Apr 2023, Shift 1 · Q63What happens when a lyophilic sol is added to a lyophobic sol?EasySingle correct
  2. 29 Jul 2022, Shift 1 · Q63100 mL of 5% (w/v) solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred…MediumSingle correct
  3. 29 Jun 2022, Shift 1 · Q65Which of the following is a correct statement ?EasySingle correct
  4. 27 Aug 2021, Shift 2 · Q31Lyophilic sols are more stable than lyophobic sols because,EasySingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.