Which gas turns lime water milky?
Answer and explanation
Correct answer: B. Carbon dioxide
- Step 1: Lime water is a clear dilute aqueous solution of calcium hydroxide, .
- Step 2: When carbon dioxide gas () is bubbled through lime water, it reacts to form an insoluble white precipitate of calcium carbonate: , turning the solution milky.
Answer
Carbon dioxide.
Why not the others: Ammonia, Hydrogen, and Oxygen do not react with calcium hydroxide solution to precipitate insoluble calcium carbonate.
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