Question

An aerosol is a colloidal system of:
(this question has multiple correct answers)
(A) Solid dispersed in gas
(B) Liquid dispersed in gas
(C) Gas dispersed in solid
(D) Gas dispersed in liquid

Answer 1

Hint: A colloidal system can be described as basically a phase separated mixture. This mixture consists of two main phases: dispersion medium and dispersed medium.

Complete Step by Step Solution:
As discussed above, a colloidal system has a dispersed phase and a dispersion phase. In order to understand these two terms, let us use an analogy. Consider any particular solution. The solution contains solute particles and solvent particles. The solute particles are mixed in the solvent particles to form the solution.
Similarly, when considering a colloidal solution, the dispersed medium acts like the solute present in a solution, while the dispersion medium acts like the solvent in the solution. An aerosol is one such example of a colloidal solution. An aerosol consists of gas as the dispersion medium wherein either solid particles or liquid particles can be used as dispersed mediums.
Hence, an aerosol is a colloidal system of solid and/or liquid dispersed in gas.

Hence, Option A and B are the correct options.

Note:
Colloidal systems can be divided into 4 main categories:
- Sol: solid in liquid
- Emulsion: liquid in liquid
- Foam: gas in solid or gas in liquid
- Aerosol: solid or liquid in gas