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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 13 April 2023, Shift 2, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. Reason R : The light scatters in all directions when the size of particles is large enough. In the light of the above statements, choose the correct answer from the options given below:
  1. (1)Both A and R are correct and R is the correct explanation of AOfficial answer
  2. (2)Both A and R are correct but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is true

Official answer

Option 1

NTA final key.

Chapter
Solutions
Topic
Colloids
Idea tested
Optical and Kinetic Properties

Same idea in other shifts

Asked 5× in all
  1. 25 Jun 2022, Shift 1 · Q62**Incorrect** statement for Tyndall effect is :EasySingle correct
  2. 27 Aug 2021, Shift 1 · Q34Tyndall effect is more effectively shown by :EasySingle correct
  3. 3 Sep 2020, Shift 1 · Q31Tyndall effect is observed when :EasySingle correct
  4. 2 Apr 2017 (offline) · Q34The Tyndall effect is observed only when following conditions are satisfied : (a) The diameter of the dispersed particles is much smaller…MediumOther

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.