Of the following sets ,which one does not contain isoeletronic species ?

Options

A. `PO_4^3 , SO_4^(2), ClO_4`
B. `CN^(-),N_2,C_2^(2-)`
C. `SO_3^(2), CO_3^(2), NO_3`
D. `BO_3^3 , CO_3^2 , NO_3`

Answer

C

Explanation

`SO_3^(2-)` (42 electrons) , `CO_3^(2-)` (32 electrons ) and `NO_3^(3-)` (32 electrons) are not isoelectric.