Carbon dioxide passed through lime water turns it milky. Which compound is formed in this reaction?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Calcium carbonate
Lime water is a solution of calcium hydroxide. Carbon dioxide reacts with it to form insoluble calcium carbonate, whose fine white particles make the solution milky: Ca(OH)2 + CO2 → CaCO3 + H2O.