General Principles and Processes of Isolation of Elements - Result Question 18
####18. Method used for obtaining highly pure silicon used as a semiconductor material, is [1994, 96]
(a) Oxidation
(b) Electrochemical
(c) Crystallization
(d) Zone refining
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Solution:
- (d) $Si$ obtained by reduction of $SiCl_4$ with $H_2$ is further purified by zone refining method to get Si of very high purity.
Silicon is purified by zone-refining process because the impurities present in it are more soluble in the liquid phase than in the solid phase.
