Q2 / 90 · JEE Main 2022 (25 Jun Shift 1) · Chemistry

Incorrect statement for Tyndall effect is

  • A
    The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
  • Correct answer
    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

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.

Hence, the correct answer is option: 'B'.

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