WBCS.LIVE practice question

What is formed when carbon dioxide is passed through lime water?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Copper sulphate
  2. Calcium carbonate
  3. Calcium carbonate
  4. Baking soda

Correct answer and explanation

Correct answer: Calcium carbonate

Explanation: āœ… Correct Answer: B. Calcium carbonate šŸ“š Explanation: When carbon dioxide is passed through lime water (calcium hydroxide), a chemical reaction occurs that produces 'calcium carbonate' and water. The calcium carbonate is insoluble and forms a white precipitate. This causes the lime water to turn 'milky'. This reaction is the standard laboratory test for the presence of carbon dioxide gas.