Q
Which of the following gases turns lime water milky?
ALP CBT-1, 10-Aug-18 S-3
2018
✓ Answer:
D
CO2
CO2 gas turns lime water milky. The chemical formula for lime water is Ca(OH)2. When CO2 is added to lime water, Calcium Carbonate is formed which forms a milky solution in water: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l). Thus, CO2 gas turns lime water milky due to the formation of Calcium Carbonate.