In the presence of which gas does lime water turn milky?
Answer and explanation
Correct answer: Carbon dioxide
The governing concept is the limewater test for carbon dioxide. When carbon dioxide is bubbled through limewater, it reacts with calcium hydroxide to form insoluble calcium carbonate, making the solution appear milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Therefore option A is correct. Hydrogen, nitrogen, and oxygen do not normally produce this milky calcium carbonate precipitate under the test conditions.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
The governing concept is the limewater test for carbon dioxide. When carbon dioxide is bubbled through limewater, it reacts with calcium hydroxide to form insoluble calcium carbonate, making the solution appear milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Therefore option A is correct. Hydrogen, nitrogen, and oxygen do not normally produce this milky calcium carbonate precipitate under the test conditions.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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