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Oxides can also be classified on the basic of oxygen content
present in them. This classification is as given below
(1)Normal oxides:- Normal oxides are those which contain as
much oxygen as permitted by the valency rule.
(2)Poly-oxides:-Those oxide which contains more oxygen than
allowed by valency rules
These are two types:-
(a)True peroxides:-The poly-oxides which can be considered
to be true salts of hydrogen peroxide are known as
true-peroxides
(b)Dioxides:- The oxides which contain higher percentage of
oxygen like peroxides but these do not give hydrogen
peroxide with dilute acids
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