Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.
Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.
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4Au(s)+ 8CN- (aq)+ 2H2O(aq) +O2(g) → 4[Au(CN) ] (aq) +4OH- (aq)
2[Au(CN)2]- (aq) +Zn(s)→ [Zn(CN)4]2-(aq) +2Au(s)
NaCN leaches gold/NaCN acts as a leacing agent / complexing agent Zn acts as reducing agent / Zn displaces gold.
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