(B) The process of $Cupellation$ is used for the refining of silver when it contains lead as an impurity. In this process,the impure silver is heated

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(B) The process of $Cupellation$ is used for the refining of silver when it contains lead as an impurity. In this process,the impure silver is heated in a cupel (a shallow porous vessel) in a blast of air. Lead is oxidized to lead oxide $(PbO)$,which is either absorbed by the cupel or blown away,leaving behind pure silver.