A) Very high temperature
B) Ultra-pure Al
C) Ultra-pure metals
D) Ultra-pure oxides
Correct Answer: C
Solution :
Zone refining is employed for preparing extremely pure metals. It is based on the principle that when a molten solution of the impure metal is allowed to cool the pure metal crystallises out while the impurities remain in the melt. Ex : Semiconductors like Si, Ge and Ga are purified by this method.
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