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A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2013 · Q31 Mark

The following half reactions occur when potassium iodate(V), KIO3, in hydrochloric acid solution oxidises iodine to ICl2⁻. IO3⁻ + 2Cl⁻ + 6H⁺ + 4e⁻ → ICl2⁻ + 3H2O I2 + 4Cl⁻ → 2ICl2⁻ + 2e⁻ What is the ratio of IO3⁻ to I2 in the balanced chemical equation for the overall reaction?

A1:1
B1:2
C1:4
D2:1

✓ Correct answer

B: 1:2

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About this question

Topic
Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 2, question 3.

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