General Science • ChemistryEasy
Which gas turns lime water milky due to the formation of an insoluble white precipitate of calcium carbonate?
A. Oxygen
B. Carbon dioxide✓ Correct Answer
C. Hydrogen
D. Nitrogen
💡 Solution & Explanation
Passing carbon dioxide through lime water produces an insoluble white precipitate of calcium carbonate, which turns the clear solution milky. Alternative gases like oxygen, hydrogen, or nitrogen do not react with calcium hydroxide in this manner. This classic chemical test is widely utilized in laboratory settings to confirm the presence of carbon dioxide gas.
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