JEE Main 2022 · 25 Jun · Shift 1 · Chemistry Q62

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ChemistrySingle correct+4 / -1Question 62 of 90

Incorrect statement for Tyndall effect is :

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

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

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

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

Answer and worked solution

Official answer: B

Tyndall effect needs particles not much smaller than the wavelength of light, so they can scatter it. Statement (B) says the opposite and is incorrect; (A), (C) and (D) are true.

(B)

Topics:Colloids

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JEE Main 2022 · 25 Jun · Shift 1, Chemistry question 62