Question

Smoke is an aerosol and a colloidal solution of carbon in air.
(A) True
(B) False

Answer 1

We have to examine the colloidal solution for this problem first because it is also given that the smoke is a colloidal solution and then about the aerosol. We will be able to choose the correct option afterwards. An aerosol is a mixture of solid in gas and colloids are solutions where the size of particles ranges from 1 to 1000nm.

Complete step by step solution
We have to select the correct dispersed phase and dispersed medium that is present in the smoke in the given question.
So, we're going to study colloidal solutions first. These are solutions where the size of the microscopic particles ranges from $1$ to $1000$ nanometres.
The colloid substance consists of two components that are phase dispersed and medium dispersed.
The colloid solution varies according to the various types of the dispersed phase and dispersed medium. For example, the solution is known as an aerosol if the dispersed phase and dispersed medium are solid and liquid, respectively.
Similarly, the colloid solution is called sol or suspension when the solid is found suspended in the liquid medium.
Smoke is now an example of aerosol, because smoke is a mixture of solid gas in which carbon atoms are found suspended in the air in the solid microscopic particles.
So, we can say that carbon or solid particles are the dispersed phase in the smoke and the air is the dispersed medium.
Hence, the correct option is (A.)

Additional Information
An aerosol is a colloid in the air or another gas containing fine solid particles or liquid droplets. Aerosols can be natural or artificial, and oceans, deserts, mountains, forests, ice and every ecosystem in between can be found in the air. Fog and geyser steam are examples of natural aerosols.

Note
They are categorized into hydrophilic (water-loving and water-attracted particles) and hydrophobic (the particles which are water-hating and repel from water) colloids, based on the interaction between the colloid particles.