Which of the following colloids cannot be coagulated easily?
(i) Lyophobic colloids.
(ii) Irreversible colloids.
(iii) Reversible colloids.
(iv) Lyophilic colloids.
The answer is the option (iii, iv) Coagulation of lyophilic colloids, also known as reversible colloids, isn’t easy as they are already stable.