Final answer:
HClO₄ is the strong acid out of the options provided.
Step-by-step explanation:
A strong acid is an acid that completely dissociates in water to produce hydrogen ions (H+). The options given are:
- A) HF: This is a weak acid.
- B) KOH: This is a strong base, not an acid.
- C) HClO₄: This is a strong acid.
- D) HClO: This is a weak acid.
- E) HBrO: This is a weak acid.
Based on this information, the strong acid out of the options provided is C) HClO₄.