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

$\text{PbO}$and${\text{PbSO}}_{\text{4}}$get reduced by$\text{PbS}$itself which is already present in mixture so because the reduction took place by mixture itself, hence is known as self reduction.

$\text{2PbO+PbS}\stackrel{\text{Δ}}{\to }{\text{3Pb+SO}}_{\text{2}}$$\uparrow$

$\text{P}\text{b}\text{S}{\text{O}}_4+\text{P}\text{b}\text{S}\underset{}{\overset{\text{Δ}}{\to }}2\text{P}\text{b}+2\text{S}{\text{O}}_2\uparrow$

${\text{SnO}}_{\text{2}}+\text{C}\to \text{Sn}+{\text{CO}}_{\text{2}}$