Incorrect statement for Tyndall effect is :-

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

During projection of movies in the cinemas hall, Tyndall effect is noticed.

It is used to distinguish a true solution from a colloidal solution.

The diameter of the dispersed particles is much smaller than the wavelength of the light used.

answer is B.

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Detailed 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;
(ii) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
Tyndall effect is used to distinguish between a colloidal and true solution.
During projection of movies in the cinemas hall, Tyndall effect is noticed

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