Q.
H−O−H bond angle in H2O is 104.5∘ and not 109∘28′ because of
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JIPMERJIPMER 2009Chemical Bonding and Molecular Structure
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Solution:
The hybridisation of oxygen in water molecule is sp3. So, water molecule must be tetrahedral and have bond angle 109∘28. But due to the presence of two lone pair of electrons on oxygen atom (repulsion between lone pair-lone pair) the bond angle decreases about 104.5∘ and the geometry becomes distorted tertrahedral or V-shaped.