The compounds formed when $KMnO_4$ is heated to $513 \ K$ are . . . . . .
- A$MnO_2, O_2$ and $KOH$
- B$K_2MnO_4, MnO_2$ and $O_2$
- C$K_2MnO_4, MnO_2$ and $H_2O$
- D$MnO, MnO_2$ and $O_2$
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