Question
Why is the bond angle of$PH _4^{+}$ more than $PH _3$ ?
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Answer
It is because according to the VSPER theory the lone pair-bond pair repulsion in $PH _3$ is higher than that of bond pair bond pair repulsion. But in $PH _4^{+}$there is only bond pair-bond pair repulsion. Hence bond angle of $PH _4^{+}$is more than $PH _3$.
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