Apentix/AP Chemistry/Unit 2: Molecular and Ionic Compound Structure and Properties/Question
AP Chemistrymediummcq1 pt

Why is the H–N–H bond angle in ammonia (107°) smaller than the tetrahedral angle?

A.The lone pair repels bonding pairs more strongly
B.Nitrogen is smaller than carbon
C.The N–H bonds are polar
D.Ammonia has only three electron domains

Explanation

Core Concept

Lone pairs sit closer to the nucleus and spread wider than bonding pairs, so the lone pair pushes the three N–H bonds together. Repulsion order lone pair–lone pair > lone pair–bonding pair > bonding pair–bonding pair explains the compression to 107°.

Correct Answer

AThe lone pair repels bonding pairs more strongly

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