A-LevelChemistryGroup 2Oct/Nov 2011Paper 1 Q181 Mark
Lime mortar is made from quicklime, water and sand. Over a period of time, lime mortar changes into a much harder form. Both fresh and old lime mortar react with aqueous hydrochloric acid but only the old lime mortar effervesces during the reaction. Which equation describes the change from fresh to old lime mortar?
ACaO + CO2 → CaCO3
BCaO + H2O → Ca(OH)2
CCa(OH)2 → CaO + H2O
DCa(OH)2 + CO2 → CaCO3 + H2O
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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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