State the reason why colloids never settle in solution?

Colloids never settle in solution because the particles are small enough to be suspended by the constant movement of the surrounding solvent molecules. This constant movement prevents the particles from settling out of the solution.

Colloids never settle in solutions because:
1. Brownian motion: Colloidal particles are in constant random motion due to their small size and the bombardment of solvent molecules. This motion prevents them from settling out of the solution.
2. Electrostatic repulsion: Colloidal particles often have a net electrical charge, which can be positive or negative. Particles with the same charge repel each other, keeping them dispersed throughout the solution.
3. Steric hindrance: Some colloids have molecules or ions adsorbed onto their surface that create a steric barrier, preventing them from coming close enough to aggregate and settle out.