Silver can be separated from lead by

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(D) The $Parkes$ process is a pyrometallurgical industrial process for removing silver from lead during the production of bullion.It is an example of

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addition of zinc (Parke's method)

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(D) The $Parkes$ process is a pyrometallurgical industrial process for removing silver from lead during the production of bullion.It is an example of liquid-liquid extraction.The process takes advantage of two liquid-state properties of zinc.The first is that zinc is immiscible with lead,and the other is that silver is $3000$ times more soluble in zinc than it is in lead.When zinc is added to liquid lead that contains silver as a contaminant,the silver preferentially migrates into the zinc.Because the zinc is immiscible in the lead,it remains in a separate layer and is easily removed.

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