When an impurity in a metal has a greater affinity towards oxygen and is more easily oxidized than the metal itself, then the metal is refined by:

Cupellation

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Zone refining

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Poling

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Electrolytic process

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Solution

The correct option is A Cupellation
Cupellation is used to separate noble metals like gold and silver. This process is carried out at a high temperature, so the impurities form oxides and slag. Since noble metals are inert, they do not get oxidised as easily as the impurities.

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