1.

What is the role of dilute NaCN in the extraction of gold?

Answer»

Solution :Gold ore on treatment with a solution of NaCN forms a complex from which the metal is obtained by REPLACEMENT
`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 [Zn(CN)_(4)]^(2-) (aq) +2Au (s)`.


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