Extraction of Metals - Result Question 75
####78. Write the balanced chemical reactions involved in the extraction of lead from galena. Mention oxidation state of lead in litharge.
(2003, 2M)
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Solution:
- The reactions involved in the extraction of lead from galena $(PbS)$ by self reduction are
$$ \begin{aligned} 2 PbS+3 O _2 & \longrightarrow 2 PbO+2 SO _2 \ PbS+2 PbO & \longrightarrow 3 Pb+SO _2 \ PbS+2 O _2 & \longrightarrow PbSO _4 \text { (side reaction) } \ PbSO _4+PbS & \longrightarrow 2 Pb+2 SO _2 \end{aligned} $$
In litharge $(PbO)$, the oxidation state of $Pb$ is +2
