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Question
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:
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:
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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.
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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