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"Native silver metal forms a, water solu...

"Native silver metal forms a, water soluble complex with a dilute aqueous solntion of NaCN in the presence of

A

nitrogen

B

oxygen

C

carbon dioxide

D

argon

Text Solution

Verified by Experts

The correct Answer is:
B
A water soluble complex of silver with a dilute aqueous solution of NaCN is sodium argentocyanide. In the cyanide process, the native form is crushed and treated with 0.1-0.2% solution of NaCN and aerated.
`4Ag + 8NaCN + 2H_2O+O_2 rarr 4Na[Ag(CN)_2] + 4NaOH`. Argentocyanide is soluble. Further metal is recovered from the complex by reduction with zinc.
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