Answer: a chemical compound
Cobalt(III) oxide – Wikipedia the free encyclopedia
Cobalt(II III) oxide – Wikipedia
Cobalt oxide is a family of chemical compounds consisting of Cobalt and Oxygen atoms. Compounds in the Cobalt oxide family include: • Cobalt(II) oxide (cobaltous oxide) CoO • Cobalt(III) oxide (cobaltic oxide) Co2O3
Cobalt(II) oxide is an inorganic compound that has been described as an olive-green or gray solid. It is used extensively in the ceramics industry as an additive to create blue colored glazes and enamels as well as in the chemical industry for producing cobalt(II) salts. A related material is cobalt(II III) oxide a black solid with the formula Co3O4.
Cobalt (III) oxide is the inorganic compound with the formula of Co 2 O 3. Although only two oxides of cobalt are well characterized CoO and Co 3 O 4 procedures claiming to give Co 2 O 3 have been described. Thus treatment of Co(II) salts such as cobalt(II) nitrate with an aqueous solution of sodium hypochlorite (also known as bleach) gives a black solid.