Which one of the following colloidal solutions is positive sol?

Blood

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Clay soil

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Smoke

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Gelatin

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Solution

The correct option is D Gelatin
Colloidal particles always carry an electric charge. It is of two types: Positive and Negative.

Positively charged sols are mostly metal hydroxides whereas negatively charged sols are metal sols or metal sulphide sols.

Among all the given options, gelatin is the correct answer.

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