The correct order of heat of formation of halogen acids is

Question

The correct order of heat of formation of halogen acids is (A)  HI > HBr > HCl > HF  (B)  HF > HCl > HBr > HI  (C)  HCl > HF > HBr > HI  (D)  HCl > HBr > HF > HI

Tardigrade Admin · Accepted Answer

The order of bond dissociation energy of hydrogen halide (or halogen acid) is as

Hy d ro g e n ha l i d e B o n d d i ssoc ia t i o n H F > H Cl > H B r > H I

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Bond dissociation energy

\propto

heat of formation
As bond dissociation energy decreases the heat of formation of halogen acids is also decreases. Hence, the order of heat of formation of halogen acids is

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

Q. The correct order of heat of formation of halogen acids is

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

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

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

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

Q. The correct order of heat of formation of halogen acids is

HI>HBr>HCl>HF

HF>HCl>HBr>HI

HCl>HF>HBr>HI

HCl>HBr>HF>HI

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

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

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

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