In NH3 bond angle is less than tetrahedral bond angle due to

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In ${NH}_{3}$ bond angle is less than tetrahedral bond angle due to

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Bond pair repulsion

Lone pair repulsion

Bond pair-lone pair repulsion

None of these

answer is C.

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Detailed Solution

In ${NH}_{3}$ although the central atom N is ${sp}^{3}$ hybridized, the bond angle is $107 °$ (instead of $109 ° 28'$ ). The decrease in bond angle is due to repulsion between the lone pair of electrons on N-atom and bond pair of electrons between $N$ and $H$ atoms.