O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2016 · Q221 Mark

Gaseous compound X is an oxidising agent. X is bubbled through separate solutions of aqueous potassium iodide and acidified potassium manganate(VII). Which row shows the colour changes when X is bubbled through these two solutions?

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Abrown to colourless, no change

Bbrown to colourless, purple to colourless

Ccolourless to brown, no change

Dcolourless to brown, purple to colourless

✓ Correct answer

C: colourless to brown, no change

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 1, question 22.

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