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

Hall-Heroult process

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Hoop method

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Baeyer's process

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Parkes process

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Solution

The correct option is C Parkes process
When lead contains impurities such as $C u, A g, B i, S b$ and $S n .$ Silver is removed by Cwhere 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.

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(A + A g) + Z n ⟶ (A + A g + Z n) cooling - --- \to \frac{x - layer}{y - layer}

x

y

(A g + P b)_{a l l o y} melt - ------ \to zinc is added (A g + P b + Z n)_{m e l t} c o o l ⟶ \frac{L a y e r X}{L a y e r Y}

(A g + P b) a l l o y m e l t a n d z i n c - ------ \to i s a d d e d (A g + P b + Z n) m e l t C o o l - - \to \frac{L a y e r x}{L a y e r y}

M e l t a n d - ------- \to Z i n c i s a d d e d (A g + P b + Z n) m e l t C o o l \to L a y e r X - --- \to L a y e r Y

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