The binary compounds of oxygen with metals and nonmetals are called Oxides.
On the basis of oxidation state oxides are classified as follows:
(i) Normal Oxides: These are such oxides in which Oxygen shows normal oxidation state or valency number – 2.
Example: Cao, So2, Al2o3
(ii) Peroxides: Peroxides are oxides containing a higher proportion of oxygen then normal oxides and oxygen have an oxidation state or valiancy number – 1.
Example: Sodium Peroxide Na2 02
(iii) Super Oxides: Superoxides are those in which the oxidation state or valiancy number of oxygen is – 0.5.
Example: Potassium superoxide K02
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