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The equation Ca(OH)₂ + CO₂ → CaCO₃ + H₂O produces:

The equation Ca(OH)₂ + CO₂ → CaCO₃ + H₂O produces:
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A Calcium carbonate
  • B Calcium oxide
  • C Calcium chloride
  • D Calcium sulphate
Correct Answer: Option A
Explanation:
Carbon dioxide reacts with limewater to form calcium carbonate, which appears as a white milky precipitate. This reaction is commonly used to test for carbon dioxide gas.

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