A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2012 · Q11 Mark

In which reaction does an element undergo the largest change in oxidation state?

ACl2 + 2OH¯ → OCl¯ + Cl¯ + H2O

B3Cl2 + 6OH¯ → ClO3¯ + 5Cl¯ + 3H2O

CCr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O

D3MnO42- + 4H+ → MnO2 + 2MnO4 + 2H2O

✓ Correct answer

B: 3Cl2 + 6OH¯ → ClO3¯ + 5Cl¯ + 3H2O

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2012 Paper 1 Variant 2, question 1.

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