Hydrogen Cyanide is a toxic gas, Mercury is a toxic metal, Antimony is a toxic solid.
Gasoline is a flammable liquid, Methane a flammable gas, Wood a flammable solid.
Hydrochloric acid is a corrosive liquid, hydrogen Chloride is a corrosive gas, and there isn't really any corrosive solids.
CO is a reactive gas, nitric acid is a liquid, and Francium (reactive to water, a pea sized amount is said to clear an swimming pool).
Radioactive materials include hard water (liquid; heavy water that has been exposed to radiation), Caesium is a solid, and Radon is a radioactive gas.
All of these in some way shape or form are byproducts of some process.