Method by which lyophobic sol can be protected.
(i) By addition of oppositely charged sol.
(ii) By addition of an electrolyte.
(iii) By addition of lyophilic sol.
(iv) By boiling.
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 5. Surface Chemistry
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By addition of lyophilic sol......
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The answer is: (iii) By addition of lyphilic sol
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