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Which is false about zone refining?...

Which is false about zone refining?

A

A. it is especially used for the refining of metals used in semi conducting devices

B

B. it is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal

C

C. Impure silicon, germanium, boron etc are refined by this method

D

D. During zone refining impurities move to the opposite direction of moving heater

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