Which of the pair(s) are correctly matched?
| Colloid type | Example | |
| A. Liquid in solids | : | Gem stones |
| B. Solid in liquid | : | Cell fluids |
| C. Solid in Gas | : | Mist |
| D. Gas in Liquid | : | Pumice stone |
| E. Liquid in solid | : | Butter |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → B and E only
A colloid is named by its dispersed phase first and its dispersion medium second. Each pair is checked against the type of that example:
A. Liquid in solids : Gem stones — Incorrect. Gem stones and some coloured glasses are solid in solid (solid sol).
B. Solid in liquid : Cell fluids — Correct. Cell fluids and paints are sols: a solid dispersed in a liquid.
C. Solid in Gas : Mist — Incorrect. Mist, fog and clouds are liquid in gas (aerosols); smoke and dust are solid in gas.
D. Gas in Liquid : Pumice stone — Incorrect. Pumice stone and foam rubber are gas in solid; froth and whipped cream are gas in liquid.
E. Liquid in solid : Butter — Correct. Butter, cheese and jellies are gels: a liquid dispersed in a solid.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Types of Colloidal Systems (rows)
| Dispersed phase | Dispersion medium | Type of colloid | Examples |
|---|---|---|---|
| Solid | Solid | Solid sol | Some coloured glasses and gem stones |
| Solid | Liquid | Sol | Paints, cell fluids |
| Liquid | Solid | Gel | Cheese, butter, jellies |
| Liquid | Gas | Aerosol | Fog, mist, cloud, insecticide sprays |
| Gas | Solid | Solid sol | Pumice stone, foam rubber |