Question

Give reason why NH3 has higher boiling point than PH3?

Answer 1

The boiling point of NH3 is higher than that of PH3 due to hydrogen bonding in the former. Unlike NH3, PH3molecules are not associated through hydrogen bonding in liquid state. That is why the boiling point of NH3is higher than PH3. 

Answer 2

As the strength of bonding in $NH_3$ is stronger than $PH_3$, it has a higher boiling point than the $PH_3$.

Explanation:

• In the periodic table, both nitrogen, as well as phosphorus, are located in group 15.
• The size of the atomic radius of the atom increases from top to bottom, due to decrease in electronegativity.
• As nitrogen is located before phosphorous, it has small size and high electronegativity. Due to this reason, it forms a strong bond with the hydrogen atoms.
• The bond present in $NH_3$ is strong hydrogen bonding.
• As phosphorus is located below nitrogen, it has a size larger than nitrogen and electronegativity lower than nitrogen.
• Due to this reason, it combines with hydrogen atoms by weak bonding such as London dispersion.
• Due to this reason, the boiling point of $NH_3$ is -33°С (higher) and $PH_3$ is -83°С (lower).

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