Q. Which is most volatile compound?
A) HI
B) HCl
C) HBr
D) HF
Explanation
(b)
Boiling point of HF is highest due to H-bonding. For other halogen acids boiling point increase in the order $HCl < HBR < HI$. Therefore, most volatile (with Lower b.pt.) is HCl.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.