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Name and discuss the principle involved ...

Name and discuss the principle involved in obtaining silicon of high purity.

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(i) Silicon of is refined by zone refining method.
(ii) It is based on the principle that melting point of a substance is lowered by the presence of impurities.
(iii) Consequently when an impure molten metal is cooled, crystals of the pure metal are solidified and the impurities remain behind the remaining metal.
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