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Account for the following: Why the acid ...

Account for the following: Why the acid strengths of halogen acids increase in the order: `HF lt HCl lt Hl` ?

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The relative acid strength of HF, HCI, HBr and HI depends upon their bund dissociation enthalpies. Since the bond dissociation enthalpy of H - X bond decrease from H-F to the size of halogen atom increase from F to I. Therefore, the acid strength increases in the opposite order, i.e., thic acid strength increase in the order : HF
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