When an impurity in a metal has greater affin | vedclass

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(A) Cupellation is a process used for the refining of noble metals like $Ag$ and $Au$. In this process,the impure metal is heated in a cupel (a shallo

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cupellation

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(A) Cupellation is a process used for the refining of noble metals like $Ag$ and $Au$. In this process,the impure metal is heated in a cupel (a shallow porous dish) in a blast of air. The impurities,which have a greater affinity for oxygen than the metal,get oxidised and are removed as slag or volatile oxides,while the noble metal remains unaffected due to its inert nature.

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

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