A-LevelChemistryElectrochemistryOct/Nov 2018Paper 1 Q331 Mark
Aqueous iron(II) sulfate can take part in redox reactions. 6FeSO4 + 7H2SO4 + Na2Cr2O7 → 3Fe2(SO4)3 + Cr2(SO4)3 + Na2SO4 + 7H2O Which redox changes occur during this reaction? 1 Fe(II) is oxidised to Fe(III). 2 Cr(VI) is reduced to Cr(III). 3 Oxygen is reduced to water.
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 B. This question tests the candidate's understanding of electrochemistry 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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