A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2021 · Q331 Mark

Which reactions are redox reactions? 1 Mg + 2HCl → MgCl2 + H2 2 2K2CrO4 + 2H⁺ → K2Cr2O7 + 2K⁺ + H2O 3 CuCO3 + 2HCl → CuCl2 + H2O + 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

D: 1 only is correct

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 33.

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