Which of the following has the lowest melting point?

N H_{3}

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P H_{3}

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A s H_{3}

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S b H_{3}

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Solution

The correct option is B $P H_{3}$
Down the group, the melting point of hydrides generally increases due to increase in van der Waals forces. But due to the presence of $H$ -bonding in $N H_{3}$ its melting point is the highest among group $15$ hydrides. Therefore, $P H_{3}$ has the lowest boiling point in group $15$ hydrides.

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