When potassium permanganate is decomposed, oxygen gas is released.
Potassium permanganate can be thermally decomposed according to the following equation:
[tex]2KMnO_4 --->K_2MnO_4+MnO_2+O_2[/tex]
The products formed are potassium manganate (K2MnO4), Manganese dioxide (MnO2), and oxygen (O2). Out of all the products, the only one that is gas is O2.
If the reaction is carried out in an open chamber, the oxygen gas would be released.
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