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Q.

Which of the following hydrides is thermally least stable?

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a

${PH}_{3}$

b

${SbH}_{3}$

c

${AsH}_{3}$

d

${NH}_{3}$

answer is D.

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Detailed Solution

The stability of hydrides decreases down the group. Thus the decreasing order of thermal stability is ${NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3}$ .

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Which of the following hydrides is thermally least stable?