1.

Explain Cyanide leaching.

Answer»

In the concentration of gold ore, the crashed ore of gold is leached with aerated dilute solution of sodium cyanide. Gold is converted into a soluble cyanide complex. The gangue, aluminosilicate remains insoluble. 

4Au (s) + 8CN- (aq) + O(g) + 2H2O (l) → 4[Au(CN)2]- (aq) + 4OH- (aq)



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