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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when

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Potassium maganate `(K_2MnO_4)` is formed when mangnese dioxide is fused with potassium hydroxide in air of formaldehyde reacts with potassium permanganate in the presence of a strong alkali.
`4KOH+2MnO_2+O_2to2K_2MnO_4+2H_2O`
`HCHO+2KMnO_4+2KOHtoK_2MnO_4+H_2O+HCOOH`
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