Question
Download Solution PDFWhich one of the following is not a colloid?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Boric acid.
- A colloidal solution is a solution in which microscopically dispersed insoluble particles of one substance are suspended in another substance.
- The suspended particle in a colloid can range from 1 to 1000 nanometres in its size.
- John Tyndall, an Irish physicist, discovered the Tyndall effect.
- Tyndall effect: It is the effect of scattering of light in colloidal dispersion but shows no light in a true solution. The light collides with the colloidal particles and is deviated (scattered) from its normal trajectory which is a straight line.
- This effect is primarily used to determine whether a certain mixture is a true solution or a colloid.
Key Points
Examples of Colloids:
| Dispersion Medium | Dispersion Phase | Type of Colloids | Example |
| Solid | Solid | Solid sol | Ruby Glass |
| Solid | Liquid | Solid emulsion/gel | Pearl, Cheese, Butter |
| Solid | Gas | Solid foam | Lava |
| Liquid | Solid | Sol | Paint, Mud |
| Liquid | Liquid | Emulsion | Milk |
| Liquid | Gas | Foam | Whipped cream |
| Gas | Solid | Aerosol | Smoke |
| Gas | Liquid | Aerosol | Fog, Mist |
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