Question

Which of the following will form the colloidal system? DP and DM represent dispersed phase and dispersion medium.
(This question has multiple correct options)
A.DP: Solid, DM: Liquid
B.DP: Liquid, DM: Solid
C.DP: Solid, DM: Gas
D.DP: Gas, DM: Gas

Answer 1

Hint: Only gas in gas systems will not form a colloidal state because all gases are miscible due to which they do not form colloids. Rest all the other systems will form colloidal states.

Complete step by step answer:
Dispersion system consists of – a Dispersed Phase (DP) and a Dispersion Medium (DM).
Dispersion medium (DM) means the medium in which the substance in form of colloidal particles and dispersed phase (DP) means the substance that is distributed in the dispersion medium in the form of colloidal particles.
DP: Solid, DM: Liquid
When the Dispersion phase is solid and the dispersion medium is liquid, then that type of colloidal system is known as Lysol. Examples are suspensions, slurries etc.
DP: Liquid, DM: Solid
A colloid system in which the dispersion medium is solid and dispersed phase is gas is known as sols. They have a more rigid structure. Examples are capillary systems, liquids in porous objects, soil, ground, etc.
DP: Solid, DM: Gas
When the Dispersion phase is solid and the dispersion medium is gas, then that type of colloidal system is known as Aerosol. Examples are fumes, dust, smoke in air etc.
DP: Gas, DM: Gas
A colloidal system which has dispersed phase as gas and dispersion medium is also gas, then this type of colloidal system is not formed.

Therefore, the correct answer is option (A), (B) and (C).

Note: The size of particles in colloid-dispersed systems is ${10^{ - 7}}m - {10^{ - 9}}m$ . The mixture is called colloidal solution. Colloidal particles consist of molecules, ions or can have the form of a macromolecule.