Which of the following is true for an emulsion?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Dispersed phase: liquid; dispersion medium: liquid
An emulsion is a colloid in which tiny drops of one liquid are spread through another liquid, as fat in milk or oil in face cream.
Why the other options are incorrect
Option (2) Dispersed phase: gas; dispersion medium: liquid — Incorrect. Gas in liquid is a foam, such as shaving cream.
Option (3) Dispersed phase: gas; dispersion medium: gas — Incorrect. Gases always mix completely, so a gas in a gas forms a true solution, not a colloid.
Option (4) Dispersed phase: liquid; dispersion medium: gas — Incorrect. Liquid in gas is an aerosol, such as fog or clouds.