Question

why does PH3 has lower boiling point than NH3?

Answer 1

 The answer should be B. Both substances are polar. The substance with the highest molecular weight, PH3 , would be expected to have the highest boiling point. It does not because of hydrogen bonding in NH3. Hope this helps and good luck with chemistry.

Answer 2

$\huge\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

• ❤.. Unlike ${NH3,PH3}$ molecules are not associated through hydrogen bonding in liquid state.
• ❤.. That is why the boiling point of ${PH3}$ is lower than${NH3}$.