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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 3 September 2020, Shift 1, Chemistry Q31

Question 31 of 75 in this shift, Chemistry question 6 of 25.

Tyndall effect is observed when :
  1. (1)The diameter of dispersed particles is much smaller than the wavelength of light used.
  2. (2)The diameter of dispersed particles is much larger than the wavelength of light used.
  3. (3)The diameter of dispersed particles is similar to the wavelength of light used.Official answer
  4. (4)The refractive index of dispersed phase is greater than that of the dispersion medium.

Official answer

Option 3

NTA final key (Sep 2020).

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. 25 Jun 2022, Shift 1 · Q62**Incorrect** statement for Tyndall effect is :EasySingle correct
  3. 27 Aug 2021, Shift 1 · Q34Tyndall effect is more effectively shown by :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.