O-LevelChemistryElectrolysis5070/12 · May/June 2023 · Q201 Mark

Which reagent and observation describes the test for a reducing agent?

Aacidified aqueous potassium manganate(VII); colourless to purple

Bacidified aqueous potassium manganate(VII); purple to colourless

Caqueous potassium iodide; colourless to purple

Daqueous potassium iodide; purple to colourless

✓ Correct answer

B: acidified aqueous potassium manganate(VII); purple to colourless

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 20.

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