1. Fe2O3, FeO, Fe3O4
2. Cr2O3, CrO, CrO3
3. SiO, SiO2
4. NO, N2O, NO2, N2O3, N2O4, N2O5
5. Cu2O, CuO, Cu2O3
6. CaO
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Answers & Comments
1. Fe2O3, FeO, Fe3O4
2. Cr2O3, CrO, CrO3
3. SiO, SiO2
4. NO, N2O, NO2, N2O3, N2O4, N2O5
5. Cu2O, CuO, Cu2O3
6. CaO