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  4. Potassium, on burning in oxygen atmosphere, gives:

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Q. Potassium, on burning in oxygen atmosphere, gives:

Haryana PMTHaryana PMT 2003

Solution:

Burning $K$ in excess $O _{2}$ gives the superoxide $K O _{2}$. Reaction with a large excess of metal will form the Oxide $K _{2} O$. The superoxide reacts with water to form the peroxide, $K _{2} O _{2}$, at low $T$ and the oxide at higher $T$ both with liberation of $O _{2}$.