Answer:
In\[NH_{4}^{+}\] ion as well as in \[C{{H}_{4}}\],
the central atom has four shared pair of electrons. Therefore, both of them
have almost the same bond angle (109°28'). But in\[N{{H}_{3}}\] molecule, due
to the presence of three shared pairs and one lone pair, the geometry gets
slightly distorted. As a result, the bond angle is \[107{}^\circ .\]
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