A) \[~N{{H}_{3}}\]
B) \[~P{{H}_{3}}\]
C) \[~As{{H}_{3}}\]
D) \[~Bi{{H}_{3}}\]
Correct Answer: D
Solution :
In V A group the thermal stability of hydrides decreases from \[\text{N}{{\text{H}}_{\text{3}}}\]to \[\text{Xe}{{\text{F}}_{\text{6}}}\]Hence, \[\text{Bi}{{\text{H}}_{3}}\]is the most unstable hydride. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\]
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