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Pb+H₂S→PbS+H₂
PbO+H₂S→PbS+H₂O
Pb+S→PbS
PbSO₄+K₂S→PbS+K₂SO₄
b) H₂CO₃+Mg(OH)₂→MgCO₃+2H₂O
H₂CO₃+Mg→MgCO₃+H₂
H₂CO₃+MgO→MgCO₃+H₂O
Mg(OH)₂+CO₂→MgCO₃+H₂O
MgO+CO₂→MgCO₃