Question

What is a sol?
A. A solid dispersed in a liquid
B. A liquid dispersed in a gas
C. A gas dispersed in a liquid
D. A gas dispersed in a solid

Answer 1

Hint: You can think of an example of sol to get an idea of Sol. The example is Gel. Now just try to figure out what is the composition of Gel to get the correct answer.

Complete step by step answer:
We can classify colloids on the basis of the phase of the dispersed substance and what phase it is dispersed in. The types of different colloids include sol, emulsion, foam, and aerosol.

Sol is a type of colloid in which solid particles are suspended in a liquid. The particles in a sol are very small. If we add a dispersing agent in sol, it may increase the stability of a sol.

There are many examples of sols which include protoplasm, gel, the starch in water, blood, paint, and pigmented ink.
Sols can display the following properties-
-The particle size from 1 nanometer to 100 nanometers
-They display the Tyndall effect
-These are heterogeneous mixtures
-They do not settle or separate over a period of time

Therefore, we can conclude that the correct answer to this question is option A.

Note: We should also know the difference between colloids,
-Sol is a colloidal suspension with solid particles in the liquid.
-An emulsion is between two different liquids.
-Foam is formed by gas particles trapped in a liquid or solid.
-Aerosol contains small particles of liquid or solid, which is dispersed in a gas.