Question

Which of the following are properties of lyophilic sols?

• A. Cannot be prepared by direct mixing and requires special methods
• B. Viscosity is more than that of solvent
• C. Particles are highly solvated
• D. Irreversible

Answer 1

Answer: (B), (C)

Particles are highly solvated
Viscosity is more than that of solvent

$\text{Properties of lyophilic Colloids(liquid loving)}$

• Some substances which can form colloids directly on mixing them with a suitable liquid(dispersion medium). Their viscosity is more than that of the medium. These colloids are called lyophilic colloids. Examples of these substances are gum, gelatine, starch, rubber.
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• They are also called reversible sols as in these sols(colloids) when the dispersion phase is separated from the dispersion medium (by evaporation). The sol can be formed again by just mixing the dispersion phase and medium again.
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• They are very stable and cannot be easily coagulated.
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• Hence option B & C are correct.