Which of the following has the lowest boiling | vedclass

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(B) The boiling point of hydrides of Group $15$ elements depends on the molecular mass and the presence of hydrogen bonding.$NH_3$ has the highest boi

Vedclass · Accepted Answer

$PH_3$

Vedclass · Answer

(B) The boiling point of hydrides of Group $15$ elements depends on the molecular mass and the presence of hydrogen bonding.$NH_3$ has the highest boiling point due to intermolecular hydrogen bonding.For the remaining hydrides $(PH_3, AsH_3, SbH_3, BiH_3)$,the boiling point increases with an increase in molecular mass due to stronger van der Waals forces.            	ext{Hydride}      	ext{Boiling point } $(K)$              $NH_3$      $238.5$              $PH_3$      $185.5$              $AsH_3$      $210.6$              $SbH_3$      $254.6$              $BiH_3$      $290.0$      Thus,$PH_3$ has the lowest boiling point.

Which of the following has the lowest boiling point?

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