O-LevelChemistryMetals & Reactivity5070/12 · May/June 2015 · Q171 Mark

Acidified potassium manganate(VII) is used as a test reagent. When it is added to an aqueous solution of compound X, the colour of the test reagent changes from ......1....... This colour change shows that X is ......2........ Which words correctly complete gaps 1 and 2?

Acolourless to purple, oxidised

Bcolourless to purple, reduced

Cpurple to colourless, oxidised

Dpurple to colourless, reduced

✓ Correct answer

C: purple to colourless, oxidised

Oracle Prep sorts past-paper questions by topic, so you can drill Metals & Reactivity and see which topics are most likely to come up next.

Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 17.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content