During the decomposition of potassium permanganate (potassium permanganate) KMnO4, potassium manganate K2MnO4

During the decomposition of potassium permanganate (potassium permanganate) KMnO4, potassium manganate K2MnO4, manganese (IV) oxide MnO2 and oxygen are formed. Write down the equation for this reaction.

2KMnO4 = K2MnO4 + MnO2 + O2 ↑
To what type of reactions on the basis of absorption or release of heat are the reactions of tasks 2 and 3? To endothermic reactions, that is, during the reaction, heat is absorbed.

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