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  4. The correct order of N - O bond lengths in NO, NO2-, NO3- and N2O4 is

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Q. The correct order of $ N - O $ bond lengths in $NO, NO_2^-, NO_3^- $ and $ N_2O_4 $ is

AIPMTAIPMT 1996Chemical Bonding and Molecular Structure

Solution:

As the bond order increases, bond length decreases and bond order is highest for NO, i.e. $2.5$ and least for $NO _{3}^{-}$, i.e. $1.33$.
So, the order of bond length is
$NO _{3}^{-}> NO _{2}^{-}> N _{2} O _{4}> NO$