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explain bond angle of hydrides of 15 gp. elements

6 years ago


Answers : (4)


Dear amit,

All these hydrides are covalent in nature and have pyramidal structure. These involve sp3 hybridization of the central atom and one of the tetrahedral position is occupied by a lone pair.

Shape of NH3 molecule

Shape of NH3 molecule

Due to the presence of lone pair, the bond angle in NH3 is less than the normal tetrahedral angle. It has been found to be 107o. Down the group the bond angle decreases as:

bond angle of trihydrides


In all these hydrides, four electron pairs, three bond pairs and one lone pair surround the central atom. Now, as we move down the group from N to Bi, the size of the atom goes on increasing and its electronegativity decreases. Consequently, the position of bond pair shifts more and more away from the central atom in moving from NH3 to BiH3. For e.g., the bond pair in NH3 is close to N in N-H bond than the bond pair in P-H bond in PH3. As a result, the force of repulsion between the bonded pair of electrons in NH3 is more than in PH3. In general, the force of repulsion between bonded pairs of electrons decreases as we move from NH3 to BiH3 and therefore, the bond angle also decreases in the same order.

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Sagar Singh

B.Tech IIT Delhi

6 years ago
Thank you so much sir awsum explanation 
one year ago
										Among the trihalides of nitrogen which one is most basic    A NF3 B NCl3 C NI3 D NBr3                 please answer this question
2 months ago
I think nitrogen tri fluoride i..e NF3 is more basic among all the halides of nitrogen because it is more elctronegative
2 months ago

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