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Friday, 9 October

JEE Main 2017 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 2 April 2017 (offline), Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30.

The Tyndall effect is observed only when following conditions are satisfied : (a) The diameter of the dispersed particles is much smaller than the wavelength of the light used. (b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used. (c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. (d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.
  1. (1)(a) and (c)
  2. (2)(b) and (c)
  3. (3)(a) and (d)
  4. (4)(b) and (d)Official answer

Official answer

Option 4

CBSE answer key (25/04/2017, used for result).

Chapter
Surface Chemistry
Topic
Colloids
Idea tested
Optical and Kinetic Properties

Same idea in other shifts

Asked 2× 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

Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.