HF is the most stable among all the hydrogen halides. Explain. OR Ex – InterviewSolution

1.	HF is the most stable among all the hydrogen halides. Explain. OR Explain the thermal stability of hydrogen halides.
Answer» HF is the most stable among all the hydrogen halides. The thermal stability decreases from HF to HI. This is due to a decrease in bond dissociation enthalpy and bond strength of H-X bond from F to I. Down the group, from F to I, atomic size increases, bond length of H-X bond increases, bond polarity decreases and hence bond strength decreases. F being of the lowest atomic size and the highest electronegativity, HF bond is stronger and highly thermally stable.

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