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| Q. |
Activated Charcoal is used to remove colouring matter from pure substances by – |
| A. | Bleaching |
| B. | Oxidation |
| C. | Adsorption |
| D. | Reduction |
| Answer» C. Adsorption | |
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Explanation: Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its surface and it becomes activated charcoal, sometimes called decolorizing charcoal. This activated charcoal can remove impurities in either the gaseous or liquid state from many solutions. It does so by the process of adsorption, or by attracting these molecules to the surface. |
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