Which is the following is/are correct for lyophilic sols?

Its surface tension is lower than that of

4 H_{2} O

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Its viscosity is higher than that of water.

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Its surface tension is higher than that of water.

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Its viscosity is equal to that of water.

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Solution

The correct options are
A Its surface tension is lower than that of $4 H_{2} O$ .
B Its viscosity is higher than that of water.
Lyophilic colloids are liquid loving colloids (Lyo means solvent and philic means loving). When these colloids are mixed with the suitable liquid, high force of attraction exists between colloidal particles and liquid. This result in formation of very stable solution called lyophilic sol. These sols are
formed by substances like gums, starch and proteins. Lyophilic sol can be easily prepared by directly mixing colloid with the liquid.
The lyophilic colloids are highly viscous in nature and have higher viscosity than that of the medium (water).
The surface tension of these sols is less than that of dispersion medium (water).

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