Why does carbon dioxide gas turn lime water milky?
Answer and explanation
Correct answer: Due to formation of calcium carbonate
Limewater is a clear solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is passed through it, the reaction Ca(OH)₂ + CO₂ → CaCO₃ + H₂O occurs. Calcium carbonate is an insoluble white precipitate, so it makes the solution appear milky. Therefore, option A is correct; the other choices name substances that are not formed in this test.
Frequently asked questions
What is the correct answer to this question?
Due to formation of calcium carbonate
Why is this the correct answer?
Limewater is a clear solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is passed through it, the reaction Ca(OH)₂ + CO₂ → CaCO₃ + H₂O occurs. Calcium carbonate is an insoluble white precipitate, so it makes the solution appear milky. Therefore, option A is correct; the other choices name substances that are not formed in this test.
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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