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Which of the following will show the “Tyndall effect”?

(a) Salt solution

(b) Milk

(c) Copper sulphate solution

(d) Starch solution.

Answer :

Tyndall effect will be shown by

(b) Milk and (d) Starch solution.

The Tyndall effect is the mechanism in which the particles in a colloid scatter the rays of light which are directed at them. All colloidal solutions and some very fine suspensions exhibit tyndall effect. Scattered light intensity depends on the colloidal particle density as well as the frequency of incident light.

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