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a) elektroliza wody:
2H₂O ---> O₂ + 2H₂
b) ogrzewanie tlenku, np. HgO
2HgO ---> O₂ + 2Hg
c) ogrzewanie soli, np. KMnO₄
2KMnO₄ ---> O₂ + MnO₂ + K₂MnO₄