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Question

Write the dispersed phase and dispersion medium of the following colloidal systems:
(i) Smoke
(ii) Milk

What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?

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Solution

Dispersed phase Dispersed medium
Smoke Solid Gas
milk Liquid Liquid
Lyophilic colloid:- Lyophilic sols are relatively stable as a strong force of interaction exists between colloidal particles and liquid. Ex. :- Gelatin, starch.

Lyophobic colloid:- lyophobic sols are less stable as a weak force exists between colloidal particles and liquid.
Ex. :- Metal hydroxide, metal sulphides.
lyophobic colloid easily gets coagulated on an addition of a small amount of electrolyte.

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