Which Gas Turns Lime Water into Milky

Answer: When limewater is bubbled with carbon dioxide gas, it produces a white solid calcium carbonate (CaCO₃) precipitate as it combines with calcium hydroxide solution or limewater. As a result, the solution gets cloudy resulting in the conversion of lime water into milky water. This experiment is performed to show lime water as a carbon dioxide gas indicator. 

​The chemical reaction is as follows:

Ca(OH) _{2Lime water} +CO₂CaCO_{3 white ppt.} +H₂O 

Thus, carbon dioxide is the gas due to which the lime water turns milky.