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91. Why are lyophilic sols self-stabilised?

Answer:

It is due to force of attraction between dispersed phase and dispersion medium.They are self stabilised because of strong attractive forces operating between the suspended particels and dispersion medium. for example gums, gelatin etc.

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92. Sky appears blue in colour. Why?

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93.

Explain the following observations:
(a) Cottrell’s smoke precipitator is fitted at the mouth of the chimney used in factories.
(b) Physical adosption is multi layered, while chemisorption non-tayered.

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