Question

Mention the dispersed phase and dispersion medium present in the following colloids:
A.Paint.
B.Froths of air.

Answer 1

Hint: We know that the heterogeneous mixture in which the minute particles of one substance which is either in solid, liquid or gaseous state are dispersed in another substance, called the dispersion medium which is either in solid, liquid or gaseous state.

Complete answer:
As we know that the colloids have been classified on the basis of it; that classification includes sol, foam, aerosol, emulsion, solid sol etc. Now, if we define the dispersion medium, it consists of two mediums; that are distinct in nature. It can be of any phase liquid, solid, or a gas. Colloids are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. There does not exist any colloidal solutions with both the dispersed phase and the dispersion in their gaseous states because the dispersed phase is already at the molecular level and disperses evenly throughout the dispersing medium.
Dispersed phase: The phase that is scattered or present in the form of colloidal particles is known as dispersed phase. Dispersion medium: The medium in which the colloidal particles are dispersed is called dispersion medium. Cheese: Cheese is made up of fats suspended or dispersed in water.
Paint is the sol type of colloid, solid dispersed phase and liquid dispersion medium.
Froths of air are foam type of colloid, gas dispersed phase and liquid type of dispersed medium.

Note:
Remember that the dispersed and dispersion medium generally are solute or solvent like which is present in small amounts is known as dispersed phase and other which is present in large manner is known as dispersion medium.