Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The number of species from the following that have pyramidal geometry around the central atom is $\_\_\_\_$

${\mathrm{S}}_2{\mathrm{O}}_3^{2-},{\mathrm{SO}}_4^{2-},{\mathrm{SO}}_3^{2-},{\mathrm{S}}_2{\mathrm{O}}_7^{2-}$