The species which has pyramidal shape is

Options

A. `NO_3^(-)`
B. `SO_3`
C. `PCl_3`
D. `CO_3^(2-)`

Answer

C

Explanation

The steric number of central atom of a pyramidal species is four. It has three bonded atoms and one lone pair. In `NO_3^(-)`, due to negative charge, the number of valence electrons in central N atom is six. All are used up to form bonds with oxygens giving zero lone pair. In `SO_3`, the central sulphur atom has 6 valence electrons. All are used up to form 6 bonds with 3 oxygen atoms (each oxygen forms 2 bonds), giving zero lone pair. In `CO_3^(2-)`, the central C atom has 6 valence electrons due to 2 units of negative charge. All are used up to form bonds with 3 O atoms giveng zero lone pair. In `PCI_3`, the central P atom has 5 valence electrons. Three are used to form bonds with `Cl` atoms and two nonbonding electrons form one lone pair.