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

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

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Oxidation:- 4Au(s) + 8CN– (aq) +2H2O(aq) + O2(g)→ 4[Au(CN)2] – (aq) + 4OH– (aq)

Reduction:- 2[Au(CN)2] – (aq) + Zn(s) → 2Au(s) + [Zn(CN)4]2– (aq)

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