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GK QUESTION#3385

What is the product formed in aqueous solution when calcium carbonate reacts with carbon dioxide and water?

  1. ACalcium oxide
  2. BCalcium hydroxide
  3. CHydrochloric acid
  4. DCalcium hydrogen carbonateCorrect answer
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Answer

D. Calcium hydrogen carbonate

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Explanation

Calcium carbonate reacts with dissolved carbon dioxide and water to give aqueous calcium hydrogencarbonate: CaCO₃(s) + CO₂ + H₂O → Ca(HCO₃)₂(aq). In solution it is present as calcium and hydrogencarbonate ions. This is the chemistry behind carbonate dissolution in carbon-dioxide-containing water.

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