Question

Potassium manganate $(K_2MnO_4)$ is formed when

• A. chlorine is passed into aqueous $KMnO_4$ solution
• B. manganese dioxide is fused with KOH in air
• C. formaldehyde reacts with potassium permanganate in the presence of strong alkali
• D. potassium permanganate reacts with cone. H$_2SO_4$

Answer 1

Answer: (C)

formaldehyde reacts with potassium permanganate in the presence of strong alkali

Answer 2

$2KOH + MnO_2 +O_2 \underrightarrow{\Delta} K_2MnO_4+H_2O$
$HCHO +KMnO_4 \rightarrow K_2MnO_4 + H_2O$
\hspace40mm +HCOOH