A-LevelChemistryCarboxylic acids and derivativesMay/June 2015Paper 1 Q401 Mark
Monopotassium citrate is used as an emulsifying agent in powdered milk and in powdered soups. It may be represented by the formula shown. CH₂CO₂H HO–C–CO₂⁻ K⁺ CH₂CO₂H monopotassium citrate Which statements about monopotassium citrate are correct? 1 It does not have a chiral carbon atom. 2 It can act as a dibasic acid. 3 It reacts with NaHCO₃ to give CO₂.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is A: 1, 2 and 3 are correct
📋 Examiner Report & Trap Analysis
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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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