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  4. Write the chemical equations involved in the extraction of lead from galena by self reduction process.

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Q. Write the chemical equations involved in the extraction of lead from galena by self reduction process.

IIT JEEIIT JEE 1979General Principles and Processes of Isolation of Elements

Solution:

In the first step, galena is heated in presence of $O_2$ (limited quantity) in a reverberatory furnace, where $PbS$ is partially oxidised to $PbO$ :
$PbS+\frac{3}{2}O_2\rightarrow PbO+SO_2$
In the second step, more $PbS$ is added and heated in absence of $O_2$, where the following self reduction takes place
$PbS+2PbO\rightarrow 3Pb+SO_2$