Which of the following is a protective colloid?

Options

A. Gelatine
B. Potato starch
C. Egg albumen
D. All of these

Answer

D

Explanation

Lyophilic sols are more stable than lyophobic sols. This is due to the fact that lyophilic colloids are extensively solvated, i.e. their colloidal particles are covered by a sheath of the liquid in which they are dispersed.
Lyophilic colloids have a unique property of protecting lyophobic colloids. When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and thus protect the latter from electrolytes. Lyophilic colloids use for this purpose are called protective colloids. Gelatine, potato strach and egg albumen are typical examples of lyophilic colloids.