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  4. PbS xrightarrow[Δ]air X, X + PbS → Pb + SO2 'X' is

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Q. $PbS \xrightarrow[\Delta]{air} X, X + PbS \to Pb + SO_2$ '$X$' is

General Principles and Processes of Isolation of Elements

Solution:

$PbS + O_2 \to PbO + SO_2$
$PbS + 2O_2 \to PbSO_4$