Уровнять,указать тип реакции.

KNO3→KNO2+O2
Fe+HOH→Fe3O4+H2
C+H2→CH4
FeCO3→FeO+CO2
Fe+O2→Fe3O4
Na2O+C→Na+CO2
S+O2→SO2
P+O2→P2O5

пожалуйста помогите
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