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InterviewSolution
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Write the principles of the following methods: (i) Vapour phase refining (ii) Zone refining (iii) Chromatography |
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Answer» (i) Vapour phase refining: In this method, crude metal is freed from impurities by first converting it into a suitable volatile compound by heating it with a specific reagent at lower temperature and then decomposing the volatile compound at some higher temperature to given the pure metal. (ii) Zone refining: It is based upon the principle that the impurities are more soluble in the molten state than in the solid state of the metal. (iii) Chromatography: It is based upon the principle that the different components of a mixture are adsorbed to different extents on an dsorbent |
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