Question

Smoke is a colloidal solution of
A. Gas in solid
B. Solid in gas
C. Gas in gas
D. Solid in liquid

Answer 1

Hint: A colloid is a mixture in which a phase remains dispersed in the suspension. The size of colloidal particles varies from 1 to 1000 nm. Due to the large size colloid solution contains the different phases of suspended particle and suspension medium.

Complete answer:
The colloidal solution is of 8 types.
Solid in gas. The colloidal type is an aerosol.
Solid in liquid. The colloidal type is a sol.
Solid in solid. The colloidal type is a solid-sol.
Liquid in solid. The colloidal type is a gel.
Liquid in liquid. The colloidal type is an emulsion.
Liquid in gas. The colloidal type is a liquid aerosol.
Gas in solid. The colloidal type is a solid foam.
Gas in liquid. The colloidal type is a foam.
Smoke is an aerosol. The dispersed phase in the aerosol is solid and the dispersion medium is gas. The aerosol is a type of colloidal solution.
Gas in solid forms solid foam of colloidal solution, for example, cork so, option (A) is incorrect.
Smoke is a colloidal solution of solid in gas so, option (B) is correct.
Gas in gas does not form a colloidal solution, so option (C) is incorrect.
Solid in liquid forms sol form a colloidal solution, for example, paint so option (D) is incorrect.

So the correct option is (B).

Note: In the options, the first word represents the dispersed phase and the second word represents the dispersion medium. On the basis of the physical appearance of the colloidal solution, the type of dispersion medium can be identified. The physical appearance of smoke is gaseous so the dispersion medium in smoke is gas.