Chemistry - Metallurgy Question with Solution | TestHub

(2) ${\mathrm{PbS}}^{+2}{\mathrm{O}}_4+\stackrel{+2}{\mathrm{Pb}}\stackrel{-2}{S}\to \stackrel{0}{\mathrm{Pb}}+2{\stackrel{+4}{\mathrm{SO}}}_2$

So given reaction is self reduction

(3) Ag ore $+{\mathrm{CN}}^{\ominus }\stackrel{{\mathrm{O}}_2}{\to }\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]$

(It is leaching process)

→ given reaction is reduction reac ${}^{\mathrm{h}}$ by Zn .

(4) Reduction potential

$${\mathrm{E}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}^{\mathrm{O}}>{\mathrm{E}}_{{\mathrm{Cu}}^{+2}/\mathrm{Cu}}^{\mathrm{O}}$$

So displacement of ${\mathrm{Cu}}^{+2}$ not possible by ${\mathrm{Ag}}^{+}$