Cloud is a colloidal dispersion of
(1) Air in a dispersion medium of water
(2) Fog in a dispersion medium of water
(3) Mist in a dispersion medium of air
(4) Water drops in a dispersion medium of air
Answer: (4) A colloid is a substance microscopically dispersed evenly throughout another substance. A colloidal system consists of two separate phases: a dispersed phase (or internal phase) and a continuous phase (or dispersion medium) in which the colloid is dispersed. A colloidal system may be solid, liquid, or gas. Cloud is a colloidal dispersion of Water drops in a dispersion medium of air.
