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- Zn+2KOH- K2ZnO2+ H2
- Fe2O3+3CO-2Fe+3CO2
- 3PbO+2NH3-3Pb+3H2O+N2
- 2Pb3O4---6PbO+O2
- 2PbS+3O2-2PbO+2SO2
- S+2H2SO4--3SO2+2H2O
- MnO2+4HCl-MnCl2+2H2O+2Cl2
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