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
2K2MnO4 + 2H2OHCHO + 2KMnO2 + 2KOH → K2MnO4 + 2H2O + HCOOH
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