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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when :

A

`Cl_2` is passed into an aqueous `KMnO_4` solution

B

`MnO_2` is fused with KOH in air

C

Formaldehyde reacts with `KMnO_4` in presence of storng alkali

D

`KMnO_4` reacts with concentrated `H_2SO_4`

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The correct Answer is:
B
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