Question

Smoke is a colloidal solution of-
A. gas in solid
B. solid in gas
C. gas in gas
D. solid in liquid

Answer 1

In order to answer this question, to know about the smoke, we should go through the whole concept of colloidal system. And then we will also discuss more about the colloidal solution and their dispersion medium and phase.

Complete step by step answer:
Smoke is a colloidal solution of solid in gas. It is an aerosol in which the dispersion medium is gas (air) and the dispersed phase is solid.
A colloidal solution is a heterogeneous system which is made up of two phases; dispersed phase (as solute) and a dispersion medium (as solvent).The substance distributed as the colloidal particles is called the dispersed phase and the second phase in which the colloidal particles are scattered is called the dispersion medium. Size of colloidal particles is in between $1{\text{ }}nm{\text{ }}to{\text{ }}1000{\text{ }}nm$ . Milk, face creams, sponge, rubber, pumice, blood, gems, etc are examples of colloids. When one constituent particle of a solution is scattered around the another, then it is called dispersion.

So, the correct answer is Option B.

Note: These particles are larger than molecules, distinguishing a colloid from a solution. However, the particles in a colloid are smaller than those found in a suspension. In smoke, for examples, solid particles from combustion are suspended in a gas.