Which is in the decreasing order of boiling points of Vth group hydrides? (a) \( \mathrm{NH}_{3}...

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Which is in the decreasing order of boiling points of Vth group hydrides?
(a) \( \mathrm{NH}_{3}\mathrm{PH}_{3}\mathrm{AsH}_{3}\mathrm{SbH}_{3} \)
(b) \( \mathrm{SbH}_{3}\mathrm{AsH}_{3}\mathrm{PH}_{3}\mathrm{NH}_{3} \)
(c) \( \mathrm{PH}_{3}\mathrm{NH}_{3}\mathrm{AsH}_{3}\mathrm{SbH}_{3} \)
(d) \( \mathrm{SbH}_{3}\mathrm{NH}_{3}\mathrm{AsH}_{3}\mathrm{PH}_{3} \)
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