Identify which substance is a diprotic acid.

Question

Accepted Answer

The correct answer is (B) H₂SO₄(aq). Sulfuric acid is a diprotic acid because it contains two ionisable hydrogen atoms and can donate two protons in aqueous solution. The first dissociation is complete (H₂SO₄ → H⁺ + HSO₄⁻), and the second dissociation is partial (HSO₄⁻ ⇌ H⁺ + SO₄²⁻). Option (A) is monoprotic (one proton), option (C) is polyprotic (three protons), and option (D) is monoprotic (one proton).

Identify acids as monoprotic, diprotic or polyprotic.

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