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By heating solid Potassium permanganate we can make oxygen in the lab.

2KMnO₄ --------Heat-------> K₂MnO₄ + MnO + O
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By heating ammonium chloride and calcium chloride (mixture) in water we can make oxygen gas in lab:

Ca(OH)₂ + 2NH₄Cl  -------- ( heating in water ) ------>  2NH₃ + CaCl₂ + 2H₂O

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