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Among the given acids, HClO₄ is a very strong acid, completely dissociates. ∴ [HA] → 0 in this case, hence cannot be used for acidic buffer.

1. HClO₄ is a very strong acid, completely dissociates.
2. HClO₄ is a weak acid, partially dissociates.
3. HClO₄ is a strong acid, partially dissociates.
4. HClO₄ is a weak acid, completely dissociates.

Correct answer: HClO₄ is a very strong acid, completely dissociates.

Solution

HClO₄ (perchloric acid) is a very strong acid and completely dissociates in aqueous solution, making option A correct. Strong acids like HClO₄ cannot be used to prepare acidic buffers as they lack the weak acid-conjugate base equilibrium required.

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