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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 June 2022, Shift 1, Chemistry Q62

Question 62 of 90 in this shift, Chemistry question 2 of 30, Section A.

**Incorrect** statement for Tyndall effect is :
  1. (1)The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
  2. (2)The diameter of the dispersed particles is much smaller than the wavelength of the light used.Official answer
  3. (3)During projection of movies in the cinemas hall, Tyndall effect is noticed.
  4. (4)It is used to distinguish a true solution from a colloidal solution.

Official answer

Option 2

NTA final key.

Chapter
Surface Chemistry
Topic
Colloids
Idea tested
Optical and Kinetic Properties

Same idea in other shifts

Asked 5× in all
  1. 13 Apr 2023, Shift 2 · Q63Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of…MediumAssertion–reason
  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.