P4O6 + H2O -> H3PO3 — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Tetraphosphorus hexoxide (P4O6) is the anhydride of phosphorous acid, with phosphorus in the +3 oxidation state. Step 2: Hydration/hydrolysis of P4O6 with cold water yields phosphorous acid (H3PO3) as the exclusive phosphorus product. Step 3: Since phosphorous acid ends with the '-ous' suffix, the correct reaction type is B.