Q. Assertion : In some cases oxygen shows positive oxidation number though it is an electronegative element.
Reason : Fluorine is more electronegative than oxygen.

 1740  232 AIIMSAIIMS 2001Redox Reactions Report Error

Solution:

Oxygen is the most electronegative element after fluorine. Therefore, in the compounds between oxygen and fluorine, oxygen is found to show positive oxidation state.

e.g. : Oxygen difluoride.

Oxidation state of oxygen here is .