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

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

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Although in both of the species, phosphorus is `sp^(3)`, but `PH_(3)` has line pair of electron, thus lp-bp repulsion decrease the angle from `109^(@)28'`.
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