What does carbon dioxide do to lime water?
Answer and explanation
Correct answer: Milky
The governing concept is the lime-water test for carbon dioxide. Lime water is an aqueous 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 solution milky. Therefore, option A is correct; the other colours are not produced in this test.
Frequently asked questions
What is the correct answer to this question?
Milky
Why is this the correct answer?
The governing concept is the lime-water test for carbon dioxide. Lime water is an aqueous 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 solution milky. Therefore, option A is correct; the other colours are not produced 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.
