OCR A · transition elements
Transition metal colours quiz
Learn the colours of aqueous ions, hydroxide precipitates and common ligand-substitution products. The written colour is always shown; the swatch is only a memory cue.
What OCR A expects
Students should connect an observation to a chemical species and, where appropriate, to an ionic equation. Colour descriptions can vary slightly with concentration, lighting and impurities, so examination wording matters more than matching a screen pixel.
Useful warning
Chromium(III) prepared from chromium alum is described as pale purple, although Cr(III) solutions often appear green because of impurities or ligand substitution. The quiz states the context explicitly.