Question

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

(a) nitrogen

(b) oxygen

(c) carbon dioxide

(d) argon

Answer 1

The correct option (b) oxygen

Explanation:

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 0.142% solution of NaCN and aerated. 

Argentocyanide is soluble. Further metal is recovered from the complex by reduction with zinc.

Comments

Thanks sir