1.

Write the ehemical reactions lnvolved in the proecess of extraction of Gold. Explain the role of dilute NaCN and Zn in this proeess

Answer»

Solution :`4Au(s)+8CN^(-) (AQ) +2H_2 O (aq)+O_2(g) to 4[AU(CN)_2]^(-) (aq)+4OH^(-) (aq)`
`2[Au(CN)_2]^(-) (aq)+Zn(s) to 2Au(s)+ [Zn(CN)_4]^(2-)` (aq)NaCN LEACHES gold/NaCN acts as a leacing agent / complexingagent Zn acts as reducing agent / Zn DISPLACES gold


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