Stability of hydrides of 15th group in increasing order is :

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${PH}_{3} < {AsH}_{3} < {NH}_{3} < {SbH}_{3} < {BiH}_{3}$

${BiH}_{3} < {SbH}_{3} < {NH}_{3} < {AsH}_{3} < {PH}_{3}$

${NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3} < {BiH}_{3}$

${BiH}_{3} < {SbH}_{3} < {AsH}_{3} < {PH}_{3} < {NH}_{3}$

answer is C.

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Detailed Solution

NH₃ is the most stable hydride because of bond strength between N-H. On moving down the group, atomic size of elements get increased, thereby the bond strength with hydrogen decreases.

Hence, option-C is correct.

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