Question
Chemistry Question on p -Block Elements
Boiling points of the hydrogen halides
A
Increases regularly in order of relativemolecular mass
B
Decreases sharply from HF to HCl and then increases
C
Decreases regularly in order of relative molecular mass
D
Increases sharply from HF to HCl and then decreases regularly with increase of relative molecular mass
Answer
Decreases sharply from HF to HCl and then increases
Explanation
Solution
The increasing order of boiling point is HCl < HBr < HI < HF Boiling point increases with increase in atomic weight of halogen due to increase in the van der Waals' forces. However, boiling point of HF is highest due to presence of hydrogen bonding.