A Level Chemistry OCR Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which substance is considered a strong acid?

Water

Sodium chloride

Hydrochloric acid

Hydrochloric acid is considered a strong acid because it completely dissociates in water to produce hydrogen ions (H⁺) and chloride ions (Cl⁻). This complete ionization means that solutions of hydrochloric acid have a high concentration of H⁺ ions, which is characteristic of strong acids. Strong acids are known for their ability to significantly lower the pH of a solution and can react vigorously with bases or other substances.

In contrast, water is a neutral substance that does not exhibit acidic properties; sodium chloride is a neutral salt formed from a strong acid (HCl) and a strong base (NaOH), and it does not contribute H⁺ ions in solution. Ammonia is a weak base that does not dissociate to produce a significant amount of H⁺ ions. Thus, hydrochloric acid stands out as the strong acid among the choices presented.

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Ammonia

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