Xác định số oxi hóa Mn; Cr; S; Cl; N; Fe trong các chất sau:
a) Mn, MnCl2, MnO2, KMnO4, K2MnO4. ...........................................................................
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b) CrCl2, CrCl3, K2Cr2O7, NaCrO2, K2Cr2O4. .....................................................................
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c) S, SO2, SO3, K2S, Al2S3, CuS, H2S, H2SO3, H2SO4, K2SO4. ..........................................
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d) Cl2, HCl, NaClO2, HClO, KClO3, HClO4, Cl2O5, Cl2O7, HClO3. ...................................
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e) NH3, N2, N2O, NO, N2O3, NO2, N2O5, HNO3, HNO2, Fe(NO3)3, NxOy. ........................
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j) FeO, FeCl2, Fe2(SO4)3, Fe(OH)3, Fe2O3, Fe3O4, FeS, FeS2,FexOy...........................................................................................................................................
