Question

What happens when potassium permanganate is heated? Explain giving balanced equation

Answer 1

When Potassium permanganate is heated it turns to Potassium manganate, manganese dioxide and oxygen gas.
2KMnO4= K2MnO4 + MnO2 + O

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Answer 2

Potassium Permanganate when heated in air it decomposes. First it loses its oxygen and then decomposes to form potassium manganite, manganese oxide and oxygen.

The balanced equation is as follows:

$2 \mathrm{KMnO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{MnO}_{4}+\mathrm{MnO}_{2}+\mathrm{O}_{2}$  

Here, two molecules of Potassium Permanganate on being heated in air produces one molecule of Potassium Manganate, one molecule of Manganese Oxide and one oxygen molecule.

This reaction shows a change in colour from purple $\left(\mathrm{KMnO}_{4}\right)$ to green $\left(\mathrm{K}_{2} \mathrm{MnO}_{4}\right)$.