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If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by
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Cupellation
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When the impurity in metal has a greater affinity for oxygen and is more readily oxidised than the metal, then purification method carried out is eupellation.
This method is used to separate noble metals like $\mathrm{Au}, \mathrm{Ag}$ from impurities like $\mathrm{Pb}, \mathrm{Cu}, \mathrm{Zn}$. present in ore.
In this method, ores are treated under right temperature and controlled operations to separate noble metals.
When the impurity in metal has a greater affinity for oxygen and is more readily oxidised than the metal, then purification method carried out is eupellation.
This method is used to separate noble metals like $\mathrm{Au}, \mathrm{Ag}$ from impurities like $\mathrm{Pb}, \mathrm{Cu}, \mathrm{Zn}$. present in ore.
In this method, ores are treated under right temperature and controlled operations to separate noble metals.
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