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The extraction of gold by leaching with ...

The extraction of gold by leaching with NaCN involves both oxidation and reduction. Justify your answer with equations.

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Gold is recovered from the complex by treating it with a more electropositive metal such as zinc. Zinc reduces `Au^(+)` to Au while itself gets oxidised to `Zn^(2+)`, which then combines with `CN^(-)` ions to form sodium tetracyanozincate (II) complex.
`2Na[Au(CN)_(2)](aq)+Zn(s)rarrunderset("Gold (pure)")(2Au(s))+underset("(Soluble complex)")underset("zincate (II)")underset("Sodium tetracyano-")(Na_(2)[Zn(CN)_(4)](aq))`
Therefore, the extraction of Au by leaching with NaCN involves both oxidation and reduction.
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