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Cyanide or Macarthur Forrest Process

Mac Arthur pr...

Question

Mac Arthur process is used for the extraction of :

A

Au

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B

Ag

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C

Cu

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D

Zn

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Solution

The correct option is B Ag
Mac Arthur process is used for the extraction of silver.
Silver sulphide reacts with NaCN to form soluble complex.
Silver is then precipitated with scrap zinc.
$A g_{2} S + 2 N a C N ⇌ N a_{2} S + 2 A g C N ↓$
$A g C N + N a C N \to N a [A g (C N)_{2}]$

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