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  4. The oxidation number of oxygen atom in O2-2 ion is

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Q. The oxidation number of oxygen atom in $O^{2-}_2$ ion is

AIIMSAIIMS 1995Redox Reactions

Solution:

Oxygen atom is monoatomic and oxidation number of an element in a monoatomic ion, is equal to the charge on the ion. i.e. -2.