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The fall in bond angle from NH₃ (106°) to SbH₃ (101°) down group 15 of the periodic table is mainly because of
- a reduction in lone pair–lone pair repulsion
- a decrease in electronegativity
- an increase in bond pair–bond pair repulsion
- a greater p-orbital contribution in sp³ hybridisation
Correct answer: a decrease in electronegativity
Solution
The bond angle decreases from NH₃ to SbH₃ primarily due to the decrease in electronegativity of the central atom, which leads to a weaker bond character and less effective lone pair repulsion, resulting in a smaller bond angle.
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