Question

Among the hydrides of group 15 elements, ______ is most stable and most basic.

Answer 1

Among the hydrides of group 15 elements, NH₃ is most stable and most basic.

Explanation:

Ammonia (NH₃) is the most thermally stable and strongest base among the hydrides of group 15. This is due to nitrogen’s small size and high electronegativity, which lead to strong N-H bonds and effective donation of its lone pair. As we go down the group, both stability and basicity decrease.