Among the hydrides NH_3, PH_3, and BiH_3, the | vedclass

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(C) The boiling point of the hydrides of the nitrogen family $(Group \ 15)$ follows the order: $PH_3 < AsH_3 < NH_3 < SbH_3 < BiH_3$. $NH_3$ has an an

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$BiH_3, PH_3$

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(C) The boiling point of the hydrides of the nitrogen family $(Group \ 15)$ follows the order: $PH_3 $NH_3$ has an anomalously high boiling point due to intermolecular hydrogen bonding, but the boiling point increases down the group due to an increase in molecular mass and van der Waals forces. Comparing the given hydrides: $PH_3$ has the lowest boiling point $(Y = PH_3)$. $BiH_3$ has the highest boiling point $(X = BiH_3)$. Therefore, $X = BiH_3$ and $Y = PH_3$.

Among the hydrides $NH_3, PH_3,$ and $BiH_3$, the hydride with the highest boiling point is $X$ and the hydride with the lowest boiling point is $Y$. What are $X$ and $Y$ respectively?

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