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Name the reagent that is used in leaching of gold .A. CarbonB. Sodium cyanideC. Carbon monoxideD. Iodine

Answer» Correct Answer - B
Leaching involves the treatment of the ore with a suitable reagent so as to make it soluble while impurities remain insoluble. Leaching of gold is done with the help of their dissolution in `NaCN or KCN` or Cu with the help of `H^(+)` or Fe scrap .
`4Au(s)+8CN^(-) +O_(2)(g) +2H_(2)O to 4[Au(CN)_(2)]^(-)+4OH^(-)`


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