Q. Which of the following is most volatile?
A) HF
B) HCl
C) HBr
D) HI
Explanation
(d)
The bond strength of H—X decreases from HF and HI because the dissociation energy of H—X bond decreases from HF to HI.
Hydrogen halide :H—F H—Cl H—Br H—I
Dissociation energy : 566 431 366 299
$(kJ\ mol^{- 1})$
HI is most volatile.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.