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a
NH3
b
PH3
c
AsH3
d
SbH3
answer is A.
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Detailed Solution
Down the group in the hydrides of 15th group electrondensity on central atom decreases Basic strength , Electron pair donation and ligand strength follows the orderNH3 > PH3 > AsH3 > SbH3Thus NH3+H+NH4+ will be trust feasible