Chemistry 9701 · AS & A Level · Group 2

Group 2 — practice question

Calcium oxide is mixed with water, and the mixture is then filtered. The liquid that passes through is filtrate X. If carbon dioxide is bubbled through filtrate X, a white precipitate appears. Which equation correctly represents the reaction between filtrate X and carbon dioxide?

  • A$\text{CaO} + \text{CO}_2 \rightarrow \text{CaCO}_3$
  • B$\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaO} + \text{H}_2\text{CO}_3$
  • C$2\text{CaO} + \text{H}_2\text{O} + \text{CO}_2 \rightarrow \text{CaCO}_3 + \text{Ca(OH)}_2$
  • D$\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3 + \text{H}_2\text{O}$

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