Answer
See the answer below.
Work Step by Step
$B.O.=N.\ Shared\ pairs\div N.\ links$
$NO_2^+$: $4/2=2$
$NO_2^-$: $3/2=1.5$
Since bond length decreases with bond order, the 110 pm is from $NO_2^+$ and the 124 pm is from $NO_2^-$.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 8 Bonding and Molecular Structure - Study Questions - Page 337d: 67
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