Complex formation method is used for the extraction of:

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Solution

The correct option is B Ag
Silver ore is treated with aqueous solution of sodium cyanide and by passing a current of air through it. The argentite ore dissolves in sodium cyanide forming sodium argento cyanide.
$A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$

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A g_{2} S + N a C N + Z n ⟶ A g

A g_{2} S + N a C N + Z n \to A g

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