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What is the bond angle in ammonia molecule?

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in Chemistry – Class 12 by (188k points)
What is the bond angle in ammonia molecule?

(a) 106.5°

(b) 107°

(c) 108°

(d) 109.5°

This question was addressed to me during an online interview.

This question is from Structure of Amines topic in division Amines of Chemistry – Class 12

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Right choice is (b) 107°

For explanation: The bond angle for a standard tetrahedral geometry is 109.5°. 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°.

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