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Cyanide or Macarthur Forrest Process

Describe the ...

Question

Describe the role of $N a C N$ in the extraction of gold from its ore.

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Solution

Gold ore is leached with dilute solution of $N a C N$ in the presence of air from which the metal is obtained later by displacement.
$4 A u + 8 N a C N + O_{2} + 2 H_{2} O \to 4 N a [A u (C N)_{2}] + 4 N a O H$ .

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