Question
Question: Zone refining is a method to obtain....
Zone refining is a method to obtain.
A
Very high temperature
B
Ultra pure Al
C
Ultra pure metals
D
Ultra pure oxides
Answer
Ultra pure metals
Explanation
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.