Chemistry - Metallurgy Question with Solution | TestHub

The reactions involved in cyanide extraction process are: $\underset{\text{ (argentite) }}{{\mathrm{Ag}}_2\mathrm{S}}+4\mathrm{NaCN}\to 2\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]+{\mathrm{Na}}_2\mathrm{S}$ $4{\mathrm{Na}}_2\mathrm{S}+\underset{\text{ Oxiding agent }}{5{\mathrm{O}}_2}+2{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{Na}}_2{\mathrm{SO}}_4+4\mathrm{NaOH}+2\mathrm{S}$ $2\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]+\underset{\begin{array}{c}\text{ (reducing }\\ \text{ agent) }\end{array}}{\mathrm{Zn}}\to {\mathrm{Na}}_2\left[\mathrm{Zn}(\mathrm{CN}{)}_4\right]+2\mathrm{Ag}\downarrow$