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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 `sp^3` hybridised. In `PH^(4+)` all the four orbitals are bonded whereas in PH3 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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