pBlock ElementsII - Result Question 72
####67. The $H-N-H$ bond angle in $NH _3$ is greater than the $H-As-H$ bond angle in $AsH _3$.
(1984, 1M)
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Solution:
- Both ’ $N$ ’ and ‘As’ in corresponding hydrides are $s p^{3}$-hybridised. If central atoms are from same group, bond angle decreases from top to bottom if all other things are similar. Hence, $H-N-H$ bond angle in $NH _3$ is greater than $H-As-H$ bond angle in $AsH _3$.
