2H2 + O2 ---> 2H2O2Cr + 3O2 ---> 2CrO34Mn + 7O2 ---> 2Mn2O74Cr + 3O2 ---> 2Cr2O32Ca + O2 ---> 2CaO2Fe + O2 ---> 2FeO
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2H2 + O2 ---> 2H2O
2Cr + 3O2 ---> 2CrO3
4Mn + 7O2 ---> 2Mn2O7
4Cr + 3O2 ---> 2Cr2O3
2Ca + O2 ---> 2CaO
2Fe + O2 ---> 2FeO