Among the following hydrides, the order of basic strength is

A $SbH X_{3} > AsH X_{3} > PH X_{3} > NH X_{3}$
B $NH X_{3} > AsH X_{3} > PH X_{3} > SbH X_{3}$
C $PH X_{3} > NH X_{3} > AsH X_{3} > SbH X_{3}$
D $NH X_{3} > PH X_{3} > AsH X_{3} > SbH X_{3}$

Answer: D

As the central atom becomes larger, the lone pair is spread over a larger volume and its availability for donation decreases. Basic strength therefore falls from NH3 to SbH3.

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Among the following hydrides, the order of basic strength is

Answer: D

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