What is the molecular geometry of $\mathrm{H}_3 \mathrm{O}^{+}$?
What is the molecular geometry of $\mathrm{H}_3 \mathrm{O}^{+}$?
Trigonal pyramid
Square planar
Trigonal bipyramidal
Trigonal planar
Solution
$\mathrm{H}_3 \mathrm{O}^{+}$has a molecular geometry of tetrahedral, since there are 4 regions of electron density surrounding the central $\mathrm{O}$ atom ( 3 hydrogens and 1 lone pair of electrons). The VSEPR shape would be trigonal pyramidal. Hence, the correct option is (1).