The method of extraction of silver by cyano complex formation followed by metal displacement is called as:

Parke's method

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MacArthur-Forest method

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Serpeck method

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Hall's method

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Solution

The correct option is B MacArthur-Forest method
Cyanide process is used for the extraction of Ag which is also called as MacArthur-Forest process.
Reactions involved in the extraction of silver are as follows:

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

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

Hence, option B is the correct answer.

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