Question

Which of the following is not an aerosol?

• A. fog
• B. soda water
• C. boot polish
• D. mist

Answer 1

Answer: (B), (C)

boot polish

Explanation for the correct options:

(B) Soda water: Soda water is an example of solution in which gas is dissolved in the liquid.

Solution: A mixture in which the particles $({10}^{-9}\mathrm{m})$ are too small to be visible through naked eyes and do not scatter the light.

(C) Boot polish: Boot polish is a colloid and is an example of gel type of colloid in which liquid is dispersed in solid.

Colloid: It is a heterogeneous mixture in which the constituent particles are of the size ${10}^{-6}\mathrm{m}-{10}^{-9}\mathrm{m}$ and do not settle down when left undisturbed.

Explanation for the incorrect options:

(A) Fog: Fog is a colloid and is an example of aerosol type of colloid in which liquid is dispersed in gas.

Aerosol: A colloidal solution in which the dispersed phase is liquid or solid and the dispersion medium is gas. Examples: Fog, mist, clouds.

• Dispersed phase: The phase which consists of the colloidal particles and present in the smaller quantity.
• Dispersion medium: The phase in which the particles are dispersed and is present in the larger quantity.

(D) Mist: Mist is also an example of aerosol in which dispersed phase is liquid and the dispersion medium is gas.

Hence, options (B) and (C) are correct.