pBlock ElementsII - Result Question 72

####67. The HNH bond angle in NH3 is greater than the HAsH bond angle in AsH3.

(1984, 1M)

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Solution:

  1. Both ’ N ’ and ‘As’ in corresponding hydrides are sp3-hybridised. If central atoms are from same group, bond angle decreases from top to bottom if all other things are similar. Hence, HNH bond angle in NH3 is greater than HAsH bond angle in AsH3.


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