The molecular geometry of the hydronium ion is best described by which of the following?
A
Linear
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B
Trigonal planar
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C
Trigonal pyramidal
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D
Tetrahedral
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Solution
The correct option is C Trigonal pyramidal The hydronium ion has a trigonal pyramidal geometry and is composed of three hydrogen atoms and one oxygen atom. There is a lone pair of electrons on the oxygen giving it this shape. The bond angle between the atoms is 113 degrees.