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Chromium oxide 
Summary
Chromium oxide may refer to:
- Chromium(II) oxide, CrO
- Chromium(III) oxide, Cr2O3
- Chromium dioxide (chromium(IV) oxide), CrO2, which includes the hypothetical compound chromium(II) chromate
- Chromium trioxide (chromium(VI) oxide), CrO3
- Chromium(VI) oxide peroxide, CrO5
- Mixed valence species, such as Cr8O21