How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

Answer

Answer:
A dispersed phase or dispersion medium in colloidal solution may be a solid, liquid or gas. Based on physical states, 8 types of colloidal systems are possible (gas in gas is not possible as gases are always miscible in all proportions forming homogeneous mixure). All other takes of combinations of gases, liquids and solids may exist as colloidal solutions. Examples are given in the following table:

Internal phase of Dispersed phase	External phase or Dispersion medium	Colloidal name	Example
Solid	Solid	Solid sols	Alloys, Ruby glass, Gems or precious stones, marbles, optical and vision glasses.
	Liquid	sols	Muddy water, gold sol, protein, starch, agar, gelatin in water, paints, pigments in water.
	Gas	Aerosols (or solids	Smoke, particulate clouds.
Liquid	Solids	Gels	Cheese, jems, jellies, plants, fruits, vegetables
	Liquid	Emulsions	Butter, milk, cosmetic products, e.g., shampoo, creams, emulsified oils, polish and medicines.
	Gas	Aerosols (or liquids)	Fog, clouds, mist.
Gas	Solid	Solid foams	Pumicestone, styrene foam, foamed rubber, porous pot. thermocole rubber pillows and mattresses.
	Liquid	Foams and froths	Lather, soap seeds, air bubble.
	Gas	Homogeneous system	Do not exist as colloids.