Question

bond angle in NH3
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Answer 1

NH3 has a tetragonal geometry and pyramidal shape. The bond angle in a tetragonal molecule is 109.5°. But, the bond angle in NH3 is 107° and not 109.5°, because if a compound contains a lone pair, then that lone pair will try to take as much space as it can. So, the lone pair in NH3 tries to take maximum space for it, that's why the bond pairs become closer to each other. This results in the decrease of bond angle in NH3.

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