IP Chemistry Upper Sec 07: Redox Chemistry

These notes align with SEAB GCE O-Level Chemistry (6092) content used in IP programmes (exams from 2026).

Status: SEAB O-Level Chemistry 6092 syllabus (exams from 2026) checked 2025-11-30 - scope unchanged; remains the reference for this note.

What you must know

• Redox definitions: oxidation = loss of electrons/oxygen gain/hydrogen loss/increase in oxidation state; reduction = gain of electrons/oxygen loss. Oxidising agents are reduced; reducing agents are oxidised.
• Redox tests: acidified $\ce{KMnO4}$ turns purple → colourless when reduced; acidified $\ce{K2Cr2O7}$