Ca(OH)2 + SO2 -> CaSO3↓ + H2O — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Calcium hydroxide solution is a clear soluble base. Step 2: Passing sulfur dioxide (SO2) gas through it yields insoluble calcium sulfite, CaSO3↓. Step 3: Since a solid precipitate forms from soluble starting materials, this is a precipitate formation reaction (type A), corresponding to option (a).