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NEET levelSingle correct optionDifficulty 1 of 3pn002

Which of the following hydrides of group 15 is the least thermally stable?

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

Answer: A

Stability of the hydrides

MH X_{3}

decreases down the group because the M-H bond becomes longer and weaker as the size of M increases. The order is

NH X_{3} > PH X_{3} > AsH X_{3} > SbH X_{3} > BiH X_{3}

, so

BiH X_{3}

is the least stable.

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