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The HNH angle is higher than HPH, HAsH and HSbH angles. Why?

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The HNH angle is higher than HPH, HAsH and HSbH angles. Why?

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Because in NH3 is sp3 hybridised. Due to lone pair of electrons the bond angle contracts from 109° 28’ to 106.5°. The sp3 hybridisation becomes less and less distinct with increasing size of the central atom. Thus, the bond angle of the hydrides of group 15 decreases as.

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