First slide
Factors influencing acidic strength, across the period and down the group
Question

Statement I: Increasing order of acidity of hydrogen halides is HF < HCI < HBr < HI.
Statement II:  While comparing acids formed by the elements belonging to the same group of the periodic table, H-A  bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond. HI bond is weaker than other halides, so lesser bond dissociation energy and more acidic nature.

Moderate
Solution

Both statements I and II are correct. Statement II is the explanation of statement I.

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