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Describe the role of NaCN in the extra...

Describe the role of
NaCN in the extraction of gold from gold ore.
Write the chemical equations for the involved reactions.

Text Solution

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Role of NaCN in the extraction of gold is to do the leaching of gold ore in the presence of air from which the gold is obtained later by displacement method.
`4Au (s) +8CN^(-)(aq) +2H_(2)O(aq) overset(O_(2))to 4[Au(CN)_(2)]^(-)(aq)+4OH^(-) (aq)`
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