1.

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

Answer»

Solution :The CHEMICAL reactions involved are :
`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)`
Zinc acts as a reducing AGENT in this reaction.


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