Final answer:
The chemical formula for potassium peroxide is KO₂.
Step-by-step explanation:
The correct chemical formula for potassium peroxide is KO₂. Potassium peroxide is an inorganic compound that forms when potassium reacts with an excess of oxygen. The formula KO₂ indicates that there are 2 potassium ions (K⁺) and 2 peroxide ions (O₂²⁻) in the compound. It is important to note that the superoxide KO₂ is also a possible compound, but it has a different chemical formula.