Answer:
i) The bond angle decreases due to the presence of lone pairs, which causes more repulsion on the bond pairs and as a result, the bond pairs tend to come closer. ii) The repulsion between electron pairs increases with an increase in electronegativity of the central atom and hence the bond angle increases.
Explanation:
The bond angle increases as the number of electron groups increases due to less repulsion between the bonded groups.
We know that in a molecule, repulsion between electron pairs affects the bond angle in the molecule. The magnitude of repulsion depends on the number of electron groups in the molecule.
The more the number of bonded electron groups in the molecule, the lesser the repulsion between electron pairs and the higher the observed bond angle.
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