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\[N{{H}_{3}}\]to\[Bi{{H}_{3}}\]. Hence,\[Bi{{H}_{3}}\]is the most unstable hydride. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\]
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