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Question
Which of the following colloids cannot be coagulated easily?
(i) Lyophobic colloids.
(ii) Irreversible colloids.
(iii) Reversible colloids.
(iv) Lyophilic colloids.
Solution
(iii) Reversible colloids.
(iv) Lyophilic colloids.
Explanation:
Sols directly formed by mixing substances like gum, gelatin, starch, rubber, etc., with a suitable liquid (the dispersion medium) are called lyophilic sols. They are also known as reversible colloid. These sols are very stable and cannot coagulate easily.
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