Q.

Favourable conditions for the colloidal solution to show tyndall effect is/are

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a

Refractive index of the dispersed phase and the dispersion medium should differ more

b

Refractive index of dispersed phase and dispersion medium should be same

c

The diameter of dispersed phase particles is not much smaller than the wave length of light used

d

Both 1 and 2

answer is D.

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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; and

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

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