Question

5. Give reasons for the following observations:
(i) NH3 has higher boiling pint than PH3.
(ii) HF is a weaker acid than HI.​

Answer 1

Answer:

1. NH3 molecules makes strong intermolecular H bonding b/w themselves. But due to lesser electronegativity of larger PH3 molecules, they cannot form Hydrogen Bonding b/w themselves. ... Therefore, the NH3 has higher boiling point than PH3.

2. because In HI iodine is less electronegative and it has large size. Therefore bonding between hydrogen and iodide is weaker. It will easily split in comparision of HF

Answer 2

Q:1.) NH3 has higher boiling pint than PH3

Ans:- NH3 molecules makes strong intermolecular H bonding b/w themselves. But due to lesser electronegativity of larger PH3 molecules, they cannot form Hydrogen Bonding b/w themselves.Therefore, the NH3 has higher boiling point than PH3.

Q:2.) HF is a weaker acid than HI.

Ans:- HF is a weaker acid than HI, even though fluorine is more electronegative than iodine-explain. It is because the bond dissociation enthalpy of H - F bond is much higher than that of H - I bond which dissociates more easily to release H+ ion.