A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2019Paper 1 Q311 Mark
In an experiment, 10 cm³ of an organic compound, J, in the gaseous state is reacted with an excess of oxygen. Steam, 20 cm³ of carbon dioxide and 5 cm³ of nitrogen are the only products. All gas volumes were measured at the same temperature and pressure. What could be the identity of J? 1 C₂H₆N₂ 2 C₂H₃N 3 C₂H₇N
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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The correct answer is C. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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