A) \[P{{H}_{3}}\]
B) \[As{{H}_{3}}\]
C) \[Sb{{H}_{3}}\]
D) \[N{{H}_{3}}\]
Correct Answer: D
Solution :
The basic strength of hydrides of pnicogens (elements of 15th group) decreases on moving down the group, because of availability of lone pair of electrons decrease. \[N{{H}_{3}}\]is the strongest Lewis base because of its small size and the highest electron density. The decreasing order of basic strength of hydrides is as follows\[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\]
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