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potassium permanganate ________ potassium manganate+manganese dioxide+oxygen. What is mean by this statement?

Potassium permanganate will decomposes into (green colored)  potassium manganate, manganese-dioxide and oxygen when exposed to light .This reaction is a laboratory method to prepare oxygen .
The reaction can be written as
2KMnO4 _________> K2MnO4  + MnO2  + O2


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