✔ 最佳答案
Is the question "how potassium permanganate is turned to manganese dioxide?"
In the presence of light, KMnO4 solution decomposes to give MnO2(s) and oxygen.
2KMnO4(aq) → K2MnO4(aq) + 2MnO2 + O2
By adding alkaline to KMnO4 solution, MnO2(s) will form as precipiate.