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Chemistry
Potassium manganate (K2MnO4) is formed when
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Q. Potassium manganate $(K_2MnO_4)$ is formed when
IIT JEE
IIT JEE 1988
The d-and f-Block Elements
A
chlorine is passed into aqueous $KMnO_4$ solution
12%
B
manganese dioxide is fused with $KOH$ in air
47%
C
formaldehyde reacts with potassium permanganate in the presence of strong alkali
26%
D
potassium permanganate reacts with conc. $H_2SO_4$
24%
Solution:
$2KOH + MnO_2 +O_2 \xrightarrow{\Delta} K_2MnO_4+H_2O$
$HCHO +KMnO_4+ 2KOH \rightarrow K_2MnO_4 + H_2O +HCOOH$