Chemistry - Metallurgy Question with Solution | TestHub

Leaching of$\mathrm{A}{\mathrm{g}}_2\mathrm{S}$is carried out by heating it with dilute solution of NaCN in presence of${\mathrm{O}}_2$.
$\mathrm{A}{\mathrm{g}}_2\mathrm{S}+4\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{N}\stackrel{\mathrm{A}\mathrm{i}\mathrm{r}}{\to }2\mathrm{N}\mathrm{a}\left[\mathrm{A}\mathrm{g}{\left(\mathrm{CN}\right)}_2\right]+\mathrm{N}{\mathrm{a}}_2\mathrm{S}$
$2\mathrm{Na}\left[\mathrm{Ag}{\left(\mathrm{CN}\right)}_2\right]+\left(\underset{\mathrm{dust}}{\mathrm{Zn}}\right)\to {\mathrm{Na}}_2\left[\mathrm{Zn}{\left(\mathrm{CN}\right)}_4\right]+2\mathrm{Ag}\downarrow$