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The chemical reagent used for leaching o...

The chemical reagent used for leaching of gold and silver ores is

A

NaCN

B

NaCN in presence of `O_(2)`

C

NaCl

D

`AgNO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
`2Ag+ 8NaCN+2H_(2)O+O_(2) overset(Delta)to 2Na[Ag(CN_(2))]+ 4NaOH`
`2Na[Ag(CN_(2))]+ Zn overset(Delta)to Na_(2)[Zn(CN_(4)]+ 2Ag`
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