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Write down the reactions involved in the...

Write down the reactions involved in the extraction of `Pb`. What is the oxidation number of lead in litharge ?

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Lead is mainly extracted from sulphide ore called galena. Roasting is done followed by reduction with carbon. Self-reduction finally takes place.
`2PbS + 3O_(2) rarr 2PbO + SO_(2)`
`PbS + 2O_(2) rarr PbSO_(4)`
`PbSO_(4) + PbO rarr 2Pb + 2SO_(2)`
`PbS + 2PbO rarr 3Pb + SO_(2)`
Litharge is chemically `PbO` and the oxidation state of lead is `+2`.
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