Cobalt oxide are oxides of Cobalt and are inorganic compounds . There are three oxides of cobalt. They are :
1) Cobalt (II) oxide known as Cobaltous Oxide or Cobalt monoxide
2) Cobalt (III) oxide known as Cobaltic oxide or Dicobalt trioxide
3) Cobalt ( II, III) oxide known as Cobaltosic oxide , Tri Cobalt tetroxide , Cobalto –cobaltic oxide.

Cobalt ( II ) oxide CAS number [1307-96-6] has Molecular formula CoO, Mol. Wt: 74.9326 gms/ mol . It is a blackish or grayish powder finds its application mainly in ceramic industries and also in chemical industries for preparing Cobalt (II ) salts such as Cobalt (II ) nitrate having Mol. Formula Co( NO3 )2.
Cobalt ( III ) oxide CAS number [1308-04-9] has Molecular formula Co2 O3, Mol. Wt: 165.86 gms/ mol. It is a black colored powder.

Cobalt (II, III ) oxide CAS number [1308-06-1] has Molecular formula Co3 O4, Mol. Wt: 240.8 gms/ mol. It is available in black colored powder form , soluble in hot acids and alkali hydroxides. Cobalt (II , III)oxide is used mainly as a pigment in glass industries.

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