A-LevelChemistryElectrochemistry9701/12 · Feb/Mar 2024 · Q231 Mark

The equations for three reactions involving chlorine or its compounds are listed. 1 2KClO₃ → 2KCl + 3O₂ 2 4KClO₃ → 3KClO₄ + KCl 3 6KOH + 3Cl₂ → 3H₂O + 5KCl + KClO₃ Which statement about these equations is correct?

AEquation 1 describes the formation of a compound used to kill bacteria in drinking water.

BEquation 1 does not represent a redox reaction.

CEquation 2 describes the formation of potassium chlorate(IV).

DEquations 2 and 3 both represent disproportionation reactions.

✓ Correct answer

D: Equations 2 and 3 both represent disproportionation reactions.

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2024 Paper 1 Variant 2, question 23.

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