Question

Method used for obtaining highly pure silicon, used as a semiconductor material, is

(a) crystallization 

(b) zone refining

(c) oxidation 

(d) electrochemical.

Answer 1

The correct option is: (b) zone refining

Explanation:

Pure silicon is made by the reduction of highly purified silicon tetrachloride (SiCl₄) with dihydrogen.

The silicon obtained is purified further by the zone refining process. A method of refining metals some inorganic and organic compounds depending on the difference in solubility of impurities in the liquid and solid states is called zone refining process.