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Identify the element which can be extracted using the flow chart given below:
Ore $\to$ froth floatation process $\to$ Treatment with $N a C N$ aqueous solution in the presence of air and filter $\to$ Treatment of filtrate with $Z n$ powder $\to$ Electrolytic refining

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$P b$

$A g$

$Z n$

$A u$

answer is B.

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Detailed Solution

$A g_{2} S + 4 N a C N \overset{a i r}{\to} 2 N a [A g {(C N)}_{2}] + N a_{2} S$

air consumes $N a_{2} S$ forcing the reaction in the forward direction.

$2 N a [A g {(C N)}_{2}] + Z n \to N a_{2} [Z n {(C N)}_{4}] + 2 A g$

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