1.

Oxidation state of oxygen is -1 in the compound :

Answer»

`NO_2`
`MnO_2`
` PbO_2`
` Na_(2)O_2`

SOLUTION :`{:(,MnO_2),(underset("sodium peroxide")(Na_(2)overset(-1)(O_(2))),pbO_2),(,NO_2):}}` are DIOXIDES


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