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Fluorine is more electronegative than io...

Fluorine is more electronegative than iodine atom, yet HF has lower acidic strength than HI.

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Fluorine atom is much smaller in size than iodine, hence `H-F` bond length is less than `H-I` and the bond dissociation energy of `H-F` is very high as compared to `H-I`. As a result, `H-I` bond breaks more readily than `H-F` and `HI` is a stronger acid than `HF`.
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