The purest form of metal can be obtained by :

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puddling

zone-refining

electrolytic refining

chromatography

answer is C.

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Detailed Solution

The purest form of metal can be obtained by zone-refining.

Zone Refining is used to get extremely pure metal samples, such as ultra-pure samples of $Ge Si, B, Ga,$ and in. This approach is predicated on the idea that impurities are more soluble in melt than the pure metal.

Hence, option C is correct.

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