A Levels Chemistry (9701)•9701/12/M/J/22
Explanation
Properties of Calcium Carbonate and Calcium Hydroxide
Steps:
- Identify key properties from the table: solubility in water and basic nature.
- Calcium carbonate (CaCO3) is insoluble in water but reacts as a base with acids.
- Calcium hydroxide (Ca(OH)2) is slightly soluble in water and acts as a base.
- Match to rows: first property (soluble) yes for Ca(OH)2, no for CaCO3; second (base) yes for both.
Why B is correct:
- B (yes no) matches Ca(OH)2 soluble and CaCO3 insoluble, per solubility rules in aqueous solutions.
Why the others are wrong:
- A (no no): Ignores Ca(OH)2 solubility.
- C (no yes): Reverses solubility order.
- D (yes yes): Falsely claims CaCO3 soluble.
Not enough information on exact table properties, but based on standard chemistry.
Final answer: B
Topic: Group 2
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