Question

Smoke is a colloidal system of _____ dispersed in _____
1. water; air
2. air; carbon
3. carbon; air
4. None of the above

Answer 1

Hint: For this problem, we have to study the colloidal solution first because it is also given that the smoke is a colloidal solution and then about the aerosol. After which we will be able to choose the correct option.

Complete Step-By-Step Answer:
- In the given question we have to choose the correct dispersed phase and dispersed medium that is present in the smoke.
- So, firstly we will study about the colloidal solutions. These are the solutions in which the microscopic particles of size ranging from 1 to 1000 nanometer.
- The colloid substance consists of two parts that are dispersed phase and dispersed medium.
- According to the different types of the dispersed phase and dispersed medium the colloid solution differs. For example, when dispersed phase and dispersed medium are solid and liquid respectively then the solution is known as an aerosol.
- Similarly, when solid is found suspended in the liquid medium then the colloid solution is called sol or suspension.
- Now, smoke is an example of aerosol because the smoke is a mixture of solid in gas in which the solid microscopic particles are carbon atoms which are found suspended in the air.
- So, we can say that the dispersed phase in the smoke is carbon or solid particles and the dispersed medium is the air.
Therefore, option 3 Will be the correct answer.

Note: Based on the interaction between the colloid particles they are classified into types that are hydrophilic (the particles which are water-loving and attracted towards the water) and hydrophobic colloids (the particles which are water-hating and repel from water).