What does carbon dioxide gas do to lime water?
Answer and explanation
Correct answer: Milky
Lime water 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. The calcium carbonate formed is insoluble and appears as a white suspension, making the lime water milky. Therefore option A is correct. The red, blue, and black changes are not the characteristic result of this carbon-dioxide test.
Frequently asked questions
What is the correct answer to this question?
Milky
Why is this the correct answer?
Lime water 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. The calcium carbonate formed is insoluble and appears as a white suspension, making the lime water milky. Therefore option A is correct. The red, blue, and black changes are not the characteristic result of this carbon-dioxide 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.
