Question

Why potassium peroxide is more stable than potassium oxide???

Answer 1

Potassium peroxide is more stable than potassium oxide bcoz potassium oxide can be formed from peroxide by adding potassium and also presence of oxygen convert oxide to peroxide and oxide can be driven to completion by using excess reactants.
Hope it helps you.

Answer 2

Potassium oxide (K2O) is an ionic compound of potassium and oxygen. This pale yellow solid, the simplest oxide of potassium, is a rarely encountered, highly reactive compound. Some materials of commerce, such as fertilizers and cements, are assayed assuming the percent composition that would be equivalent to the chemical compound mixture K2O.