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Write the chemical reactions involved in the extraction gold using sodium cyanide.

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Gold ores are leached with sodium cyanide solution in presence of air. Due to oxidation gold dissolves in sodium cyanide forming complex.
`8NaCN + 4Au + 2H_(2)O + O_(2) rarr 4Na[Au(CN)_(2)] + 4NaOH`
The metal is recovered by displacement method by adding zinc.
`2Na[Au(CN)_(2)] + Zn rarr Na_(2)[Zn(CN)_(2)] + 2Au`.
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