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| Q. |
Impure camphor is purified by – |
| A. | sublimation |
| B. | fractional crystallisation |
| C. | fractional distillation |
| D. | steam distillation |
| Answer» A. sublimation | |
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Explanation: Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process. |
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