Question

nh3 is basic but bih3 is only feebly basic.explain​

Answer 1

Answer:

Both NH  

3

​  

 and BiH  

3

​  

 have lone pair of electrons on the central atom and hence should behave as Lewis bases. But NH  

3

​  

 is much more basic than BiH  

3

​  

. This can be explained on the basis of electron density on the central atom. Atomic size of N(70 pm) is much smaller than that of Bi(148 pm). Therefore the electron density on N−atom is much higher than that on Bi−atom. Consequently, the tendency of N in NH  

3

​  

 to donote its pair of electrons is much higher than that of Bi in BiH  

3

​  

. Thus, NH  

3

​  

 is much more basic than BiH  

3

​  

.

Explanation: