Q 2519001819.     When `MnO_2` is fused with KOH, a coloured compound is formed, the product and its colour are

JEE 2003 Prelims
A

`K_2MnO_4`,. deep green.

B

`KMnO_4` , purple.

C

`Mn_2O_3` dark brown.

D

`Mn_3O_4`, black.

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