Which acid is classified as diprotic, meaning it can donate two protons per molecule in aqueous solution?
Answer and explanation
Correct answer: B. Sulfuric acid
Sulfuric acid (H2SO4) has two ionizable protons (dissociating in two stages to HSO4- and SO4^2-) and is diprotic. HCl and HNO3 are monoprotic; H3PO4 is triprotic.
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