Multiple choice The bond angle of H3O+ ion is ___________. 109.5 degrees 120 degrees < 109.5 degrees 104.5 degrees 180 degrees Reveal answer Fill a bubble to check yourself A Correct answer Explanation In H3O+, there are 3 bonding pairs and one 1 pair. The theoretical bond angle for 4 electron domains is "tetrahedral", i.e.109.5.