PbO2 + ----> PbO+ CO2
SnO2+ ----> Sn+ ........
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PbO2 + C -----> PbO + CO2
SnO2 + 2H₂ -----> Sn + 2H2O
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PbO2 + C -----> PbO + CO2
SnO2 + 2H₂ -----> Sn + 2H2O