Mac Arthur process is used for:

A g

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F e

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C l

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O_{2}

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Solution

The correct option is A $A g$
Cyanide process (Mac Arthur Forrest Process): This is used for extraction of $A g$ and $A u$ . It is based on the fact that gold/silver dissolves in dilute solution of sodium cyanide in presence of atmospheric oxygen with the formation of complex cyanide.

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

Silver is obtained by reaction with Zn:
$2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g$

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