Among the following ions,the ppi - dpi overla | vedclass

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(C) In the $PO_4^{3-}$ ion,the central phosphorus atom has vacant $d$-orbitals available for bonding.The $\pi$-bond in the $P=O$ bond is formed by the

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$PO_4^{3-}$

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(C) In the $PO_4^{3-}$ ion,the central phosphorus atom has vacant $d$-orbitals available for bonding.The $\pi$-bond in the $P=O$ bond is formed by the sidewise overlapping of the $d$-orbital of $P$ and the $p$-orbital of oxygen,which is a $p\pi - d\pi$ overlap.In $NO_2^-$,$NO_3^-$,and $CO_3^{2-}$,the central atoms ($N$ and $C$) belong to the second period and do not have vacant $d$-orbitals,so they cannot form $p\pi - d\pi$ bonds.

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

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