CAIE IGCSE Chemistry Potassium Manganate and Iodide Redox Tests

Practise using acidified potassium manganate(VII) and potassium iodide colour changes to identify reducing or oxidising substances in redox tests.

Exam points

identify a reducing agent when acidified manganate(VII) changes from purple to colourless
identify an oxidising agent when iodide solution changes from colourless to brown iodine
state the acidic condition for the manganate(VII) test and report both start and end colours

[Maximum number: 2]

Sulfur is a Group VI element.

$\mathrm{Na}_{2} \mathrm{SO}_{3}$ is oxidised by acidified aqueous potassium manganate(VII).

State the colour change when this reaction happens.
from to

All question bank results loaded