Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

Reactions involved in extraction of gold 4Au +8CN^{-}+2H_{2}O+O_{2}\rightarrow 4\left [ Au(CN)_{2} \right ]^{-}+4OH^{-}2\left [ Au\left ( CN \right )_{2} \right ]^{-}+Zn\rightarrow \left [ Zn(CN)_{4} \right ]^{2-}+2Au

Dilute NaCN is added as a reagent which is selectively dissolves the ore but not the impurities and zinc is added to obtain metal by reducation.

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