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 crystallizes out while the impurities remain in the melt. Ex: Semiconductors like \[Si,\text{ }Ge\]and \[Ga\]are purified by this method.
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