NCERT Class XI Chemistry Solutions

Question : 8

Total: 40

Although geometries of NH3 and H2O molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

Solution:

Bond angle in NH3 is 107.5° and in H2O, angle is 104.5°. In H2O, oxygen has two lone pairs and in NH3, nitrogen has only one lone pair. In H2O, two lone pairs on oxygen repel each other and the bonded pairs more strongly and cause them to come closer thereby reducing the angle.

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