Which of the following is a strong acid?Select an answerAHCOOHBHCNCCH3COOHDHClO4

To determine which of the given options is a strong acid, let's analyze each option briefly:

1. A. HCOOH (Formic Acid) - This is a weak acid. It does not completely dissociate in solution.
2. B. HCN (Hydrocyanic Acid) - This is also a weak acid. It has very low acid dissociation constants.
3. C. CH₃COOH (Acetic Acid) - This is a weak acid. Similar to formic acid, it does not fully dissociate in solution.
4. D. HClO₄ (Perchloric Acid) - This is a strong acid. It completely dissociates in solution, making it one of the strongest acids known.

Final Answer

The strong acid among the choices provided is D. HClO₄ (Perchloric Acid).