Which of the following species is/are not liberating oxygen gas on reaction with water at 25°C? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify the solubility and acidity parameters. Barium oxalate, BaC2O4↓, is an insoluble precipitate, but has a higher solubility product (Ksp) compared to calcium oxalate. Step 2: Analyze the effect of acetic acid (AcOH). Acetic acid is strong enough to protonate the oxalate ions of barium oxalate, dissolving the precipitate to form soluble barium acetate (Ba(AcO)2) and oxalic acid. Step 3: Since the solid precipitate is dissolved by the acid to yield a clear solution, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).