A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2011Paper 1 Q161 Mark
Sodium iodide reacts with concentrated sulfuric acid. The equation which represents one of the reactions that takes place is shown. 8NaI + 9H2SO4 → 8NaHSO4 + 4I2 + H2S + 4H2O Which species has been oxidised in this reaction?
AH⁺
BI⁻
CNa⁺
DSO4²⁻
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The correct answer is B. This question tests the candidate's understanding of atoms, molecules and stoichiometry 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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