Question -
Answer -
The molecular geometry of NH3 andH2O can be shown as:
The central atom (N) in NH3 hasone lone pair and there are three bond pairs. In H2O, there are twolone pairs and two bond pairs.
The two lone pairs present in the oxygenatom of H2O molecule repels the two bond pairs. This repulsion isstronger than the repulsion between the lone pair and the three bond pairs onthe nitrogen atom.
Sincethe repulsions on the bond pairs in H2O molecule are greater thanthat in NH3, the bond angle in water is less than that of ammonia.