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The bond angles in NH(4)^(+) and CH(4) a...

The bond angles in `NH_(4)^(+)` and `CH_(4)` are same but `NH_(3)` has different bond angle. Why ?

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In `NH_(4)^(+)` ion as well as in `CH_(4),` the central atom has four shared pair of electrons. Therefore, both of them have almost the same bond angle `(109^(@)28')` and tetracedral geometries. But in `NH_(3)` molecule, due to the presence of three shared pairs and one lone pair, the geometry gets slightly distorted. It is pyramidal in nature. As a result, the bond angle is `107^(@).`
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