Question

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

Answer 1

On the basis of physical states of the dispersed phase and dispersion medium, the colloidal solutions classified into eight types of colloidal systems as shown in the following table.
Note: A mixture of gas with another gas is a homogeneous mixture and not a colloidal solution.

Dispersed phase	Dispersion medium	Type of colloidal solution	Example
Solid	Solid	Solid sol	Alloys
Solid	Liquid	Sol	Paints
Solid	Gas	Aerosol	Smoke
Liquid	Solid	Gel	Jelly
Liquid	Liquid	Emulsion	Milk
Liquid	Gas	Aerosol	Mist
Gas	Solid	Solid sol	Pumice
Gas	Liquid	Foam	Soap