Question

What is the reason for the stability of colloidal sols

Answer 1

There are two main reasons for the stability of colloidal sols:
Solvation: Colloidal particles are covered by a sheath of liquid in which they are extensively solvated, thereby providing stability.

Electrostatic stabilisation: Presence of equal and similar charges on the colloidal particles prevents coagulation of the colloidal sol.

Answer 2

Answer:

The stability for colloidal sols is due to Brownian movement and presence of equal i,e., and similar charges which causes repulsion between then and prevents the coagulation of the sol.