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NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 9
Total: 74
The HNH angle value is higher than HPH, HAsH and HSbH angles. Why? [Hint : Can be explained on the basis of sp3 hybridisation in NH3 and only s–p bonding between hydrogen and other elements of the group].
Solution:  
The actual bond angles are
NH3‌PH3‌AsH3‌SbH3
106.5°‌93.5°‌91.5°‌91.3°
The decreased bond angle in other hydrides can be explained bythe fact that the sp3 hybridisation becomes less and less distinct withincreasing size of the central atom i.e., pure p-orbitals are utilised in M-Hbonding.
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