Question

Which is the most stable hydride of nh3 ph3 ash3 and sbh3?

Answer 1

answer : NH3 , ammonia is the most stable hydride in 15th group.

explanation : we know, size of elements increases when we go down the group. it means down the group, size of central atom E increases, with the increase in size of central atom, electronegativity decreases, As a result, the force of repulsion between bond pairs decreases and therefore, E - H bond becomes weaker.

so, order of bond strength of hydride is NH3 > PH3 > AsH3 > SbH3 ..

so, order of stability of hydride of elements of 15th group is NH3 > PH3 > AsH3 > SbH3 ..

hence, it is clear that NH3 is most stable hydride.