Question

8. During extraction of gold by leaching with NaCN,why O2
is bubbled through the reaction mixture?
​

Answer 1

Answer:

to increase the dissolved oxygen concentration in the slurry

hope it may help u ☺️☺️☺️

Answer 2

During the extraction of gold by leaching with NaCN, oxygen is bubbled through the reaction mixture because:\

Oxygen removes electrons from gold atoms to form the complex from which the metal is obtained.

- It is a redox process in which oxygen removes one electron from each gold atom to form the complex ion [Au(CN₂)]⁻.

4 Au + 8 CN⁻ + 2 H2O + O2 → 4 [Au(CN₂)]⁻ + 4 OH⁻

- Pure gold is obtained from this complex by replacement with metals like zinc.