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Bond angle in "PH"(4)^(" "+) is higher t...

Bond angle in `"PH"_(4)^(" "+)` is higher than that in `"PH"_(3)`. Why ?

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Both are sp3 hybridised. In `PH_(4)^(+)` all the four orbitals are bonded whereas in `PH_(3)` there is a lone pair of electrons on P, which is responsible for lone pair-bond pair repulsion in `PH_(3)` reducing the bond angle to less than `109^(@)28.`.
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