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Chromium oxides [change]
- Chromium(II) oxide, black, rare, reducing agent
- Chromium(III) oxide, dark green
- Chromium(IV) oxide, black, used in cassettes
- Chromium(VI) oxide, chromium trioxide, red, oxidizing agent, toxic
Chromium acids [change]
- Chromic acid, dissolving of chromium(VI) oxide in water
Other chromium(II) compounds [change]
- Chromium(II) chloride, blue when dissolved in water, unstable
Other chromium(III) compounds [change]
- Chromium(III) chloride, green when containing water (hydrated), purple when not containing water (anhydrous)
- Chromium(III) sulfate
- Chrome alum
Other chromium(VI) compounds [change]
- Chromyl chloride, red liquid
Chromates and dichromates [change]
Chromates are generally yellow, while dichromates are red or orange. Both are toxic and oxidizing agents.
The chromate ion is CrO42-.
The dichromate ion is Cr2O72-.