Sat March 10, 2012 By: Haleema Rafeeq

explain why N-O bond in NO2(subscript)minus shorter than N-O bond in NO3(sub)minus

Expert Reply
Sat March 10, 2012
Bond length increases with decreasing bond order. The nitrogen–oxygen bond order in NO3- is less than the nitrogen–oxygen bond order in NO2- (1.3 versus 1.5, respectively). Therefore, NO3- has longer nitrogen–oxygen bonds than does NO2-.
For reference :

The nitrate ion has three equivalent resonance structures.

There are four NO bonding pairs distributed over three NO bonding locations.

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