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Q. Potassium manganate $(K_2MnO_4)$ is formed when

IIT JEEIIT JEE 1988The d-and f-Block Elements

Solution:

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