What are lyophilic and lyophobic colloids? Which of these sols can be easily
coagulated on the addition of small amounts of electrolytes?
Lyophobic sols: Substances like metals, their sulphides, etc., when simply
mixed with the dispersion medium do not form the colloidal sol. Their colloidal
sols can only be prepared by specific methods. They are not much hydrated
and are irreversible in nature. They are also called extrinsic colloids.
Lyophilic sols: Liquid loving colloids in which there is affinity between
disperse phase and dispersion medium.
Example: Starch sol, Gum sol, Gelatin sol