N2 oxidation number of element

The oxidation number is equal to the charge on the ion. N2 is the divalent ion so the charge on N2 is zero as both the nitrogen atom share same number of electron and have same electronegativity. The dipole moment of N2 is zero. Therefore the cxidation number of N2 is 0(zero).

Explanation:

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the answers would be

the first one and the second one