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Silver containing lead as an impurity is removed by

$ (a)\;\text{Poling} \\(b)\;\text{Cupellation } \\(c)\;\text{Lavigation} \\ (d)\;\text{Distillation} $

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A)
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In Cupellation method the impure metal is heated in a blast of air when impurities are oxidised and blown away. For example, when impure silver is heated in air, lead present in it is oxidised to litharge (PbO) and blown away leaving a shining of silver.
Hence Silver containing lead as an impurity is removed by Cupellation.
Hence b is the correct answer.
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