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Group 15 ElementsP Block elements G15-18

Bond angle in $PH_{4}^{+}$ is higher than that in $PH_{3}$ . Why?

Expert Answer

Both are $sp^3$ hybridized. $PH_{4}^{+}$ has 4 bond pairs, while $PH_{3}$ has a lone pair which causes lone pair-bond pair repulsion, reducing the angle to less than $109^{\circ} 28'$ .

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