Final answer:
When Chromium (III) oxide is mixed with potassium, it forms potassium chromite and oxygen gas in a redox reaction.
Step-by-step explanation:
When Chromium (III) oxide (Cr2O3) is mixed with potassium, a chemical reaction occurs. The balanced chemical equation for this reaction is:
4Cr2O3(s) + 12K(s) → 4K2Cr(s) + 3O2(g)
In this reaction, Chromium (III) oxide reacts with potassium to form potassium chromite (K2Cr), a red solid, and oxygen gas. This is an example of a redox reaction, where there is a transfer of electrons between the reactants.