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Cyanide or Macarthur Forrest Process

Which of the ...

Question

Which of the following is not added the extraction of silver by cyanide process?

A

N a C N

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B

Air

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C

Z n

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D

{N a}_{2} S_{2} O_{3}

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Solution

The correct option is D ${N a}_{2} S_{2} O_{3}$
Air $(O_{2})$ and $N a_{2} S_{2} O_{3}$ are not added to the extraction of silver by cyanide process. The reactions during the process are as shown.
$A g_{2} S + 4 N a C N ⇌ 2 N a [A g (C N)_{2}] + N a_{2} S$
$2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

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