Question

Which among the following is a colloid with solid as the dispersed phase and gas as the dispersion medium?

A) Fog
B) Cloud
C) Air
D) Smoke

[1 Mark]

Answer 1

Correct answer is D) Smoke.

[1 Mark]

A colloid is a heterogeneous mixture in which the dispersed phase is distributed non-uniformly in the dispersion medium.

Colloids containing dispersed phase as liquid/solid and dispersion medium as gas are known as aerosols.

Air is a homogeneous mixture of various gases. So, it is not a colloid.
Fog, clouds and smoke are aerosols. However, fog and clouds contain liquid as dispersed phase and gas as dispersion medium. Smoke contains solid as dispersed phase and gas as dispersion medium.

Therefore, correct answer is smoke.