- Orthophosphoric acid – H3PO4
- Osmium tetroxide – OsO4, osmium(VIII) oxide
- Osmium trioxide – OsO3, osmium(VI) oxide
- Oxygen difluoride – OF2
- Ozone – O3
Inorganic Chemical Compounds Starting with O
List of Inorganic and Organometallic Compounds
By Anne Marie Helmenstine, Ph.D., About.com Guide
This is a list of inorganic and organometallic compounds which have names beginning with the letter O.
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