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Q.

Silver can be removed from lead by :

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a

fractional crystallisation

b

liquation

c

cupellation

d

addition of zinc (Parke's method)

answer is D.

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Detailed Solution

Silver can be removed from lead by the addition of zinc (Parke's method).

When using Parkes' process, lead and zinc are combined and melted. When agitated, Silver and Gold present in the Lead react with the molten Zinc to generate compounds. These zinc combinations are lighter than lead and, when cooling, produce an easily removable crust.

Hence, Silver can be removed from lead by the addition of zinc 

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