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CBSE Class 12-science Answered

Please tell me 
How bond angle vary in NH3 , PH3 AsH3 AND SbH3 and also tell me variation of bond angle in PF3 ,
PCl3 , PBr3 AND PI3.
Asked by Virender Rawat | 18 Sep, 2014, 01:08: PM
answered-by-expert Expert Answer
Dear sr.virender@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.

We cannot entertain more than 2 questions in a single query. In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.
 
Answer to your first question is given below:

The angle around the central atom H-M-H decreases from NH3 to SbH3 as,

Hydride

NH3

PH3

AsH3

SbH3

H-M-H angle

1070

920

910

900

 

  • This variation in bond angle can be explained on the basis of electronegativity of the central atom.
  • Since nitrogen atom is highly electronegative. So in NH3 there is high electron density around the N atom which causes greater repulsions between the electron pairs around the N atom resulting in maximum bond angle.
  • Since electronegativity decreases down the group, the electron density also decreases and consequently the repulsive interactions between the electron pairs also decrease thereby decreasing the bond angle H-M-H.

 

 
 
Regards

Topperlearning Team.
Answered by Vaibhav Chavan | 22 Sep, 2014, 01:22: PM

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