Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 27 August 2021, Shift 2, Chemistry Q31

Question 31 of 90 in this shift, Chemistry question 1 of 30, Section A.

Lyophilic sols are more stable than lyophobic sols because,
  1. (1)the colloidal particles have positive charge.
  2. (2)the colloidal particles have no charge.
  3. (3)the colloidal particles are solvated.Official answer
  4. (4)there is a strong electrostatic repulsion between the negatively charged colloidal particles.

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. 25 Feb 2021, Shift 2 · Q33Which one of the following statements is FALSE for hydrophilic sols ?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.