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The zone refining process for metals is based on the idea that:

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Higher impurity melting temperature than pure metal melting point.

Solid metal has a more noble nature than an impurity.

Higher impurity solubility in molten state compared to solid

Pure metal is more mobile than an impurity.

answer is A.

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Detailed Solution

The principle of zone refining of metals is

greater solubility of impurity in the molten state than in the liquid, or solid state.

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