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What is the nature of elements which are...

What is the nature of elements which are purified by zone-refining method ?

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Semiconductors, e.g., `Si`, `Ge`, `Ga`, etc.
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(vi) Which element is purified by zone refining ?

Find the number of metals from the given metals which can be commercially purified by zone refining methods : Si, Ge, Ga, Al, Ti, Zr .

Hightly pure metal can be obtained by zone refining

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