Of the following hydrides which has the lowest boiling point?

N H_{3}

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P H_{3}

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S b H_{3}

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A s H_{3}

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Solution

The correct option is B $P H_{3}$
$N H_{3}$ will have the highest boiling point because $N H_{3}$ molecules can form hydrogen bonds with each other. The other molecules will increase in boiling point with size. So, in order of decreasing boiling point the compounds are:
$N H_{3} > S b H_{3} > A s H_{3} > P H_{3}$

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