Q. 113.6( 10 Votes )

Explain why NH3 is basic while BiH3 is only feebly basic.

Answer :

Nitrogen has a smaller size than Bismuth, because on going down the group the atomic size increases i.e. N<P<As<Sb<Bi, as shown below:


Due to smaller size, there is very high electron density around Nitrogen as compared to Bismuth. Therefore, nitrogen atom can easily release electrons. And, we know higher the electron donating tendency, higher is the basic strength. Due to which NH3 is more basic than BiH3.


Note: The basic strength in group 15 is in the following pattern:


NH3 > PH3 > AsH3 > SbH3 > BiH3



Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
List of p Block Elements45 mins
Introduction to p Block Elements49 mins
Mastering Inorganic | p Block elements part 144 mins
p Block Elements - Kick Start Your Preparation43 mins
Mastering Inorganic | p Block elements part 245 mins
Hydrolysis of inorganic compounds46 mins
Be a master of Hydrogen & s block elements - Revision Tips40 mins
Revise Hydrogen & s Block elements with Rapid Quiz47 mins
The Embryonic Development62 mins
NCERT Exemplar Special | The Living World Part 225 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses