Cambridge IGCSE Chemistry · Syllabus 0620 · Chemical Reactions
Redox Colour Test
What is Redox Colour Test?
The use of a colour change as evidence that a redox reaction has occurred. Acidified aqueous potassium manganate(VII) is decolourised from purple when a reducing agent reduces manganese from plus seven to plus two, and colourless aqueous potassium iodide turns brown when an oxidising agent oxidises iodide ions to iodine.
This definition is part of the Chemical Reactions chapter in Cambridge IGCSE Chemistry.