The physical stability of colloidal sols is a critical factor in understanding surface chemistry and — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Stability in colloidal sols is governed primarily by two forces. First, all particles possess the exact same electrical charge, causing electrostatic repulsion that prevents coagulation (Option B). Second, specifically in lyophilic sols, the particles strongly attract the solvent, forming a protective solvation layer that acts as a physical barrier against particle collisions (Option C). Sedimentation causes instability, and Brownian motion opposes gravity to maintain stability.