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Question: Answered & Verified by Expert
Incorrect statement for Tyndall effect is
ChemistrySurface ChemistryJEE MainJEE Main 2022 (25 Jun Shift 1)
Options:
  • A The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
  • B The diameter of the dispersed particles is much smaller than the wavelength of the light used.
  • C It is used to distinguish a true solution from a colloidal solution.
  • D During projection of movies in the cinemas hall, Tyndall effect is noticed.
Solution:
1935 Upvotes Verified Answer
The correct answer is: The diameter of the dispersed particles is much smaller than the wavelength of the light used.

Tyndall effect is observed only when the following two conditions are satisfied.

(i) The diameter of the dispersed particles is not much smaller than the wavelength of the light used; and

(ii) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

This is a characteristic property of the colloid solutions.

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