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In the fopllowing reaction , identify ...

In the fopllowing reaction , identify the compound / rteaction condition represented by A and B
`PbS overset("Heat in air") to A + PbS overset(B) to Pb + SO_(2)`

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`PbS overset("Heat in air")(to) PbO + PbS`
`PbO + PbS overset("Heat in the obsence of air")(to) Pb + SO_(2)`
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