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Q. In $P_4O_{10}$,the:

BITSATBITSAT 2005

Solution:

In $P _{4} O _{10}$, the terminal $P - O$ bonds are formed by $p \pi- d \pi$ back bonding. This bonding results in the formation of a coordination bond resulting from an overlap of the $p$ orbitals of oxygen with empty $d \pi$ orbitals of phosphorus. Here, phosphorus atoms donate a lone pair of electrons resulting in $\pi$ back bonding.