Question

The H-N-H bond angle in NH\(_3\) molecule is

• A. 101°
• B. 90°
• C. 109° 28'
• D. 107° 18'

Hint:

In molecules with a trigonal pyramidal shape like NH\(_3\), the bond angle is slightly less than the ideal tetrahedral angle of 109.5°.

Answer 1

The Correct Option is D

Step 1: Understanding the bond angle in NH\(_3\).
Ammonia (NH\(_3\)) has a trigonal pyramidal geometry, where the bond angle is slightly less than 109.5°, the ideal bond angle for a tetrahedral structure. The actual bond angle in NH\(_3\) is around 107° 18'.

Step 2: Analyzing the options.
(A) 101°: This bond angle is too small for NH\(_3\).
(B) 90°: This bond angle is incorrect as NH\(_3\) has a pyramidal shape with a larger bond angle.
(C) 109° 28': This is the ideal bond angle for a tetrahedral molecule, not for NH\(_3\).
(D) 107° 18': Correct — This is the observed bond angle in NH\(_3\).

Step 3: Conclusion.
The correct answer is (D) 107° 18', as it is the bond angle in NH\(_3\).