Chemistry · Oct / Nov 2025 · Paper 12 · Question 18

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

1. Acolourless to purple; oxidised
2. Bcolourless to purple; reduced
3. Cpurple to colourless; oxidised
4. Dpurple to colourless; reduced

As printed in the paper