The correct order of thermal stability of the hydrides of group 15 is

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

Answer: B

Down the group the E-H bond becomes longer and weaker because the size of E increases and orbital overlap with H falls. Hence stability decreases from NH3 to BiH3.

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The correct order of thermal stability of the hydrides of group 15 is

Answer: B

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