Question

Among the following ions, the $p\pi -d\pi$ overlap could be present in:

• A. $N{O}_3^{-}$
• B. $P{O}_4^{3-}$
• C. $C{O}_3^{2-}$
• D. $N{O}_2^{-}$

Answer 1

Answer: (B)

$P{O}_4^{3-}$

In $N{O}_3^{-},C{O}_3^{2-},N{O}_2^{-}$ only $p-p$ orbitals are involved in bonding.
In $P{O}_4^{3-}$, $3d$ orbitals of phosphorus are also involved in bonding.