Select correct statement(s) (a) colloids are used to protect lyophilic colloids (b) Dehydrating ...

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Select correct statement(s)
(a) colloids are used to protect lyophilic colloids
(b) Dehydrating agent is used to coagulate sols
(c) Rubber is obtained by coagulation of latex
(d) Sometimes, the rainfall occurs when two oppositely charged clouds meet
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