Zone refining is used for the

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Purification of metal

The concentration of an ore

Purification of an ore

Reduction of metal oxide

answer is C.

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Detailed Solution

Zone refining is used for the purification of metal. It is the most important of the zone-melting techniques. In zone refining, a solid is refined by passing a number of molten zones through it in one direction. Each zone carries a fraction of the impurities to the end of the solid charge, thereby purifying the remainder.

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