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  4. The correct order of the thermal stability of hydrogen halides (H - X)is :

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Q. The correct order of the thermal stability of hydrogen halides (H - X)is :

AIEEEAIEEE 2005The p-Block Elements - Part2

Solution:

In a group, $\Delta G^{\circ}_{f}$(HX) changes from - ve to + ve downwards.
$HF \left(g\right) \Delta G =- 273 .20 \,kJ \,mol^{-1}$
$HI\left(g\right) \Delta G = + 1.72 \,kJ\, mol^{-1}$
Thus HF is thermally stable and HI not.
Thus $HF > HCI > HBr > HI$