Question

Smoke is an example of:
(A) Liquid in gas mixture
(B) Gas in solid mixture
(C) Solid in gas mixture
(D) Gas in liquid mixture

Answer 1

Hint: We might have all seen smoke. We know that smoke is a collection of air borne particles that float about in the atmosphere as gas. We also know that smoke is emitted into the atmosphere when something is burned. If we look closely about the other situations when smoke is emitted, we can see that it is an unwanted by-product of combustion.

Complete step by step solution:
Mixtures can be classified into many types based on the composition of those mixtures. Even air which has a lot of different gasses like oxygen, carbon dioxide, nitrogen etc., Although mixtures contain chemical components, they are not anything like a chemical compound.
They involve only physical mixing of components and can be separated using physical means. Also, there are no energy changes involved when a mixture is made. Although the components of a mixture may have a definite chemical formula, the mixture does not have a chemical formula or structure.
In a way, mixtures are just like solutions and have a dispersion medium and a dispersed phase that results in the formation of a mixture. We know that smoke is a heterogeneous mixture of solids in a fluid /gaseous medium.
Thus, we can say that smoke is a mixture with solid particles in the dispersed phase and gas as the dispersed medium.
Therefore, the correct option is C.

Note:
Some examples of mixtures are:
-Liquid in gas mixture: fog, mist, vapour and hair sprays.
-Gas in solid mixture: aerogel, Styrofoam.
-Solid in gas mixture: Smoke, ice clouds, dust.
-Gas in liquid mixture: foam, whipped cream, shaving cream