Chemistry - General Principles and Processes of Isolation of Metals Question with Solution | TestHub

$\text{4Au}\text{+}{\text{8CN}}^{-}\text{+}{\text{2H}}_{\text{2}}\text{O}\text{+}{\text{O}}_{\text{2}}\to \text{4}{\left[\text{Au}{\left(\text{CN}\right)}_{\text{2}}\right]}^{-}\text{+}{\text{4OH}}^{-}$
$2{\left[\mathrm{A}\mathrm{u}{\left(\mathrm{C}\mathrm{N}\right)}_2\right]}^{-}+\mathrm{Z}\mathrm{n}\to {\left[\mathrm{Z}\mathrm{n}{\left(\mathrm{C}\mathrm{N}\right)}_4\right]}^{2-}+2\mathrm{A}\mathrm{u}$