The correct answer is C. H₂SO (Sulfuric acid), as it is a strong acid that donates protons. The other options are bases or not classified as acids. Acids are characterized by their ability to donate protons and typically have a pH less than 7. ;
The acid among the options is C. H₂SO₄ (Sulfuric acid), which donates protons and is characterized by a pH less than 7. Other options are bases, not acids. Sulfuric acid is a strong acid commonly used in industries.
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