$(A + A g) + Z n ⟶ (A + A g + Z n) cooling - --- \to \frac{x - layer}{y - layer}$
x layer - solid alloy y layer - molten metal
Layer $x$ contains:

Z n + P b

alloy

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Z n + A g

alloy

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only

A g

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only

P b

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Solution

The correct option is B $Z n + A g$ alloy
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 impure lead. The former is immiscible with the latter. Silver is more soluble in molten zinc than in molten lead. Zinc-silver alloy solidifies earlier then molten lead and thus can be separated.
Layer $x = Z n + A g$ alloy
Layer $y = P b$

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