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

On roasting$\mathrm{H}\mathrm{g}\mathrm{S}$and$\mathrm{P}\mathrm{b}\mathrm{S}$sulphides ores are partly converted into their respective oxides. Since the oxides of$\mathrm{H}\mathrm{g}$and$\mathrm{P}\mathrm{b}$are unstable. While that of zinc is stable, therefore, oxides of$\mathrm{H}\mathrm{g}$and$\mathrm{P}\mathrm{b}$bring about the reduction of their sulphides to metals, but zinc oxides does not reduce$\mathrm{Z}\mathrm{n}\mathrm{S}$to$\mathrm{Z}\mathrm{n}$metal