Pb is a very important element of carbon family. It forms a number of compounds which are very useful in industries. The removal of impurity of Ag from the commercial lead is called:

Softening process

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Liquation

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Parkes process

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Cupellation

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Solution

The correct option is D Parkes process
Lead contains impurities such as Cu, Ag, Bi, Sb, and Sn. Silver is removed by Parke's process where molten zinc is added to molten lead. The former is immiscible with the latter. Silver is more soluble in molten zinc than in the molten lead. Zinc-silver alloy solidifies earlier then molten lead and thus can be separated.

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