MCQ
What is the bond angle in ammonia molecule?
- A$106.5^\circ $
- ✓$107^\circ $
- C$108^\circ $
- D$109.5^\circ $
✓
Answer
Correct option: B.
$107^\circ $
The bond angle for a standard tetrahedral geometry is $109.5^\circ .$ But the ammonia molecule contains a lone electron pair on nitrogen.
As it is closer to the $N$ atom than the other orbitals, it creates a repulsive effect and pushes the Hydrogen atoms close to each other, thus reducing the bond angle to $107^\circ .$
As it is closer to the $N$ atom than the other orbitals, it creates a repulsive effect and pushes the Hydrogen atoms close to each other, thus reducing the bond angle to $107^\circ .$
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