Answer
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Work Step by Step
The bond order of $HF_2^-$ is 0.5 vs 1 for HF so the energy required to break the one bond of the ion will be smaller than to break the bond of the molecule.
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 9 Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals - Study Questions - Page 369g: 69
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