A-LevelChemistryGroup 2May/June 2017Paper 1 Q151 Mark
Calcium oxide is added to water and the resulting mixture is filtered. This filtrate is X. When carbon dioxide is bubbled through filtrate X, a white precipitate is formed. Which equation for this reaction of filtrate X with carbon dioxide is correct?
ACaO + CO₂ → CaCO₃
BCa(OH)₂ + CO₂ → CaO + H₂CO₃
C2CaO + H₂O + CO₂ → CaCO₃ + Ca(OH)₂
DCa(OH)₂ + CO₂ → CaCO₃ + H₂O
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of group 2 within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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