(a) Write the chemical reactions involved in the exraction of gold usi – InterviewSolution

1.	(a) Write the chemical reactions involved in the exraction of gold using sodium cyanide.
Answer» SOLUTION :(a)` 4M+(8CN^-)+2H_2O+O_2to4[M(CN)_2]+4OH^_ 2[M(CN)_2]+Znto[Z_n(CN)_4]^2-+2Mdownarrow(M=Ag or AU)`(b) `Cu_2S+Fes`

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