The correct order of boiling points of hydrid | vedclass

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Question

(A) The boiling points of hydrides of group $15$ elements depend on the molecular mass and the presence of intermolecular forces. As we move down the

Vedclass · Accepted Answer

$PH_3 < AsH_3 < NH_3 < SbH_3 < BiH_3$

Vedclass · Answer

(A) The boiling points of hydrides of group $15$ elements depend on the molecular mass and the presence of intermolecular forces. As we move down the group,the molecular mass increases,which leads to an increase in the magnitude of van der Waals forces,causing the boiling point to increase. However,$NH_3$ possesses intermolecular hydrogen bonding due to the high electronegativity and small size of the nitrogen atom. This hydrogen bonding results in an anomalously high boiling point for $NH_3$ compared to $PH_3$ and $AsH_3$. The correct order is $PH_3 < AsH_3 < NH_3 < SbH_3 < BiH_3$.

The correct order of boiling points of hydrides of $15^{th}$ group elements is

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