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Bond Order and Enthalpy

Why bond angl...

Question

Why bond angle of $N H_{3}$ is greater bond angle of $P H_{3}$ ?

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Solution

Nitrogen is more electro-negative than phosphorous and hence attracts electron more towards itself from bond pair with hydrogen, as compared to attraction of electrons by phosphorous in $P H_{3}$ .
The electrons in $N H_{3}$ come closer to nitrogen and due to this electrons tries to repel each other. This leads to increase in bond angles of $N H_{3}$ .

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(1) N H_{3} > P H_{3} > N F_{3} (2) N F_{3} > N H_{3} > P H_{3}

(3) N H_{3} > N F_{3} > P H_{3} (4) P H_{3} > N H_{3} > N F_{3}

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