A) \[N{{H}_{3}}\]
B) \[P{{H}_{3}}\]
C) \[As{{H}_{3}}\]
D) \[Sb{{H}_{3}}\]
Correct Answer: A
Solution :
Thermal stability of the hydrides decreases gradually from \[\text{N}{{\text{H}}_{\text{3}}}\]to \[\text{Bi}{{\text{H}}_{3}}.\]This is due to the reason that atomic size of the element increases down the group and N?H bond strength decreases.
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