Question

Fog is an example of a colloidal system with liquid dispersed in gas.
A.True
B.False

Answer 1

Hint:The dispersed phase of fog in the colloidal system is liquid and the dispersion medium of fog in the colloidal system is gas. So, it is the aerosol of liquid. The other examples of aerosols of liquid are cloud, mists and insecticide sprays etc.

Complete step by step answer:
The colloidal system can also be called colloidal dispersion and colloidal suspension. The mixture of two substances which are dispersed phase and dispersion medium or dispersing medium is called colloidal system. Dispersed phase is also known as colloid. The colloid is uniformly distributed in finitely divided by the dispersion medium.
The dispersion medium can be a gas, liquid or solid and the dispersed phase can also be any of these. The system of liquid or solid particles which are colloidally dispersed in gas are termed as aerosol. The system of solid substance or water insoluble liquid which are colloidally dispersed in liquid is termed as hydrosol.
Scattering of light by particles in the colloid is called the tyndall effect because some colloids are translucent.
The colloid particles which are attracted to water are called Hydrophilic colloids. They are also known as reversible sols. The colloids which are repelled by water are called Hydrophobic colloids. They are also known as irreversible sols.
The dispersed phase of fog in the colloidal system is liquid and the dispersion medium of fog in the colloidal system is gas. So, it is the aerosol of liquid.
So, the correct option is (A).


Note:The colloids can be prepared by two ways:
By using condensation, precipitation and redox reactions for the condensation of small dissolved molecules into large colloidal particles.
By milling, spraying or application of shear for the dispersion of large particles.