Three students A, B, C prepared mixtures using chalk powder, common salt and milk respectively in water. Whose mixture would show Tyndall effect?

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A and C

B and A

Only C

A, B and C are all equal

answer is A.

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Detailed Solution

Mixtures A and C would show the Tyndall effect.
Mixture of chalk powder with water and milk with water is a colloidal solution so the Tyndall effect is shown by these solutions. The Tyndall effect can be deifned as the effect of light scattering in a colloidal dispersion, while showing no light in true solution. It is used to determine whether a mixture is a true solution or a colloid.

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