Question

According to Born-Haber cycle, the acid strength of Halogen depends upon :
A. Enthalpy of dehydration
B. Enthalpy of dissociation
C. Dipole moment
D. Electron affinity $X^-$
E. Metal ion
Choose the most appropriate answer from the options given below :

• A. A, B, C only
• B. B, C, D only
• C. C, D, E only
• D. A, B, D only

Hint:

For halogen acids, the dominant factor determining their relative acidity order in water (HI > HBr > HCl $\gg$ HF) is the Bond Dissociation Enthalpy, as the H-X bond becomes much weaker down the group, outweighing changes in electron affinity and hydration enthalpy.

Answer 1

The Correct Option is D