Question

Method by which lyophobic sol can be protected

• A. By additions of oppositely charged sol.
• B. By additions of an electrolyte
• C. By addition of lyophilic sol
• D. By boiling

Answer 1

Answer: (C)

By addition of lyophilic sol

Answer 2

Lyophilic colloids have a unique property of protecting lyohobic colloid. When a lyophilic sol is added to the lyohobic sol, the lyophilic particles form a layer around lyophobic particles and thus protect the latter from electrolytes. Lyophilic colloids used for this purpose are called protective colloids.