A-LevelChemistryElectrochemistry9701/12 · Feb/Mar 2020 · Q51 Mark

In the redox reaction shown, how do the oxidation states of vanadium and sulfur change? VO2+ + SO2 → V3+ + SO42-

Avanadium from +1 to +3, sulfur from 0 to -2

Bvanadium from +1 to +3, sulfur from +4 to +6

Cvanadium from +5 to +3, sulfur from 0 to -2

Dvanadium from +5 to +3, sulfur from +4 to +6

✓ Correct answer

D: vanadium from +5 to +3, sulfur from +4 to +6

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2020 Paper 1 Variant 2, question 5.

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