Answer
Please see the work below.
Work Step by Step
We know that formate ion $HCO_2$ has trigonal planar geometry by the VSEPR model. According to VSEPR model the bond angle is predicted to be $120^{\circ}$.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 10 - Molecular Geometry and Chemical Bonding Theory - Questions and Problems - Page 422: 10.32
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