why pcl5 is more covalent then pcl3 ?

PCl5 is a non-polar covalent molecule because individual dipole moments of P-Cl bond cancel out each other but PCl3 is a polar covalent molecule. Therefore, PCl5 is more covalent than PCl3.

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PCl5 is more covalent than PCl3 as the electronegavity of cl is greater than of P thus Cl attracts the electrons towards itself and there is a very large defiency created on p thus p becomes more electronegative  in PCl5 keeping the lone pairs back with it wich is slightly less possible in PCl3 due less number of Cl

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