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Questions
How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
How are colloids classified on the basis of the physical states of components in the dispersed phase and the dispersion medium?
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Solution
One criterion for classifying colloids is the physical state of the dispersed phase and dispersion medium. The type of dispersed phase and dispersion medium (solid, liquid, or gas) determines the eight types of colloidal systems.
| Dispersed phase | Dispersion medium | Type of colloid | Example |
| Solid | Solid | Solid Sol | Gemstone |
| Solid | Liquid | Sol | Paint |
| Solid | Gas | Aerosol | Smoke |
| Liquid | Solid | Gel | Cheese |
| Liquid | Liquid | Emulsion | Milk |
| Liquid | Gas | Aerosol | Fog |
| Gas | Solid | Solid foam | Pumice stone |
| Gas | Liquid | Foam | Shaving cream |
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How are colloids classified on the basis of Physical states of components
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| Column I | Column II |
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| (iii) Positively charged colloid | (c) Emulsion |
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