A) \[N{{H}_{3}}\]
B) \[P{{H}_{3}}\]
C) \[As{{H}_{3}}\]
D) \[Sb{{H}_{3}}\]
E) \[Bi{{H}_{3}}\]
Correct Answer: E
Solution :
Thermal stability of hydrides of N family decreases gradually from\[N{{H}_{3}}\]to\[Bi{{H}_{3}}\]due to increase in\[MH\]bond strength down the group on account of increase in size of central atom. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\] Decomposit \[1300{}^\circ C\text{ }440{}^\circ C\text{ }280{}^\circ C~150{}^\circ C\] Room ion temp. : temp.
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