Which substance is not used for preparing lyophilic cols ?

Starch

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Gum

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Gelatin

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Metal sulphide

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Solution

The correct option is D Metal sulphide
Lyophilic sols are prepared by just dissolving substance into water e g., sols of starch, gum and gelatin are prepared by dissolving them in water. So, metal sulphides are not used to prepare lyophilic sols.

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