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The H-bonding is present in HF due to high electronegativity of fluorine atom. While H-bonding is not present in HI, HBr and HCl.

1. HClO4 is the strongest acid amongst all because the oxidation state of Cl is maximum (+7).
2. If acidic nature is high, Ka is high and pKa is low.
3. Ka H2O > H2S > H2Se > H2Te
4. Ka 1.8 × 10⁻⁶ > 1.3 × 10⁻⁷ > 1.3 × 10⁻⁴ > 2.3 × 10⁻³

Correct answer: If acidic nature is high, Ka is high and pKa is low.

Solution

Option B is correct because a higher acidic nature corresponds to a higher acid dissociation constant (Ka) and a lower pKa value, as pKa = -log(Ka).

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