Chemistry - Metallurgy Question with Solution | TestHub

A water soluble complex of silver with a dilute aqueous solution of $\mathrm{NaCN}$ is sodium argentocyanide. In the cyanide process, the native form is crushed and treated with $0.1-0.2\%$ solution of $\mathrm{NaCN}$ and aerated. $$4\mathrm{Ag}+8\mathrm{NaCN}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2⟶4\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]+4\mathrm{NaOH}$$ Argentocyanide is soluble. Further, metals are recovered from the complex by reduction with zinc