Provide the distinction between a monoprotic acid and diprotic acid. Determine whether the acids listed below are monoprotic or diprotic: 
(i) Hydrocyanic acid (HCN)
(ii) Tartaric acid (H₂C₄H₄O₆)

• A. A monoprotic acid has only one H⁺ ion to donate, while a diprotic acid has two H⁺ ions to donate.
  (i) monoprotic acid
  (ii) diprotic acid
• B. A monoprotic acid has only one H⁺ ion to donate, while a diprotic acid has two H⁺ ions to donate.
  (i) diprotic acid
  (ii) monoprotic acid
• C. A monoprotic acid has two H⁺ ions to donate, while a diprotic acid has only one H⁺ ion to donate.
  (i) monoprotic acid
  (ii) diprotic acid
• D. A monoprotic acid has two H⁺ ions to donate, while a diprotic acid has only one H⁺ ion to donate.
  (i) diprotic acid
  (ii) monoprotic acid

Answer: (A)