Define the following :(a) Sol(b) Aerosol(c) Emulsion(d) FoamGive one example of each.

(a) Sol: Sol is a colloidal suspension of very small solid particles in a continuous liquid medium. They are quite stable and show the Tyndall effect.

Examples: blood and paint.

(b) Aerosol:  Aerosol is a colloidal suspension of fine solid particles or liquid droplets in a gas.

Examples: clouds and fog.

(c) Emulsion: Emulsion is a colloid of two or more liquids that are normally immiscible. 

Examples: milk and butter.

(d) Foam: Foam is formed by trapping pockets of gas in a liquid.

Examples: soap bubbles and shaving cream.