Hydrogen and its compoundHard

Question

Potassium manganate (K2 MnO4) is formed when :

Options

A.chlorine is passed into aqueous KMnO4 solution
B.manganese dioxide is fused with potassium hydroxide in air
C.formaldehyde reacts with potassium permanganate in presece of a strong alkali
D.potassium permanganate reacts with conc sulphuric acid

Solution

2MnO2 + 4KOH + O2 2K2MnO4 + 2H2O
HCHO + 2KMnO2 + 2KOH → K2MnO4 + 2H2O + HCOOH

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