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

Question

The correct order of the thermal stability of hydrogen halides (H - X)is : (A) HI > HCl < HF > HBr (B) HCl < HF > HBr < HI (C) HF > HCl > HBr > HI (D) HI > HBr > HCl > HF

Tardigrade Admin · Accepted Answer

In a group, Δ G°f(HX) changes from - ve to + ve downwards. HF (g) Δ G =- 273 .20 kJ mol-1 HI(g) Δ G = + 1.72 kJ mol-1 Thus HF is thermally stable and HI not. Thus HF > HCI > HBr > HI

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

$H I > H Cl < H F > H B r$

$H Cl < H F > H B r < H I$

$H F > H Cl > H B r > H I$

$H I > H B r > H Cl > H F$

In a group, $Δ G_{f}^{\circ}$ (HX) changes from - ve to + ve downwards.
$H F (g) Δ G = - 273.20 k J m o l^{- 1}$
$H I (g) Δ G = + 1.72 k J m o l^{- 1}$
Thus HF is thermally stable and HI not.
Thus $H F > H C I > H B r > H I$

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

HI>HCl<HF>HBr

HCl<HF>HBr<HI

HF>HCl>HBr>HI

HI>HBr>HCl>HF

In a group, ΔGf∘​(HX) changes from - ve to + ve downwards. HF(g)ΔG=−273.20kJmol−1 HI(g)ΔG=+1.72kJmol−1 Thus HF is thermally stable and HI not. Thus HF>HCI>HBr>HI

$H I > H Cl < H F > H B r$

$H Cl < H F > H B r < H I$

$H F > H Cl > H B r > H I$

$H I > H B r > H Cl > H F$

In a group, $Δ G_{f}^{\circ}$ (HX) changes from - ve to + ve downwards.
$H F (g) Δ G = - 273.20 k J m o l^{- 1}$
$H I (g) Δ G = + 1.72 k J m o l^{- 1}$
Thus HF is thermally stable and HI not.
Thus $H F > H C I > H B r > H I$