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When MnO(2) is fused with KOH, a coloure...

When `MnO_(2)` is fused with `KOH`, a coloured compound is formed. The product and its colour is

A

`K_(2)MnO_(4)`,purple green

B

`KMnO_(4)` , purple

C

`Mn_(2)O_(3)`, brown

D

`Mn_(3)O_(4)`, black

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Stable oxidation state of Mn in alkaline medium is `+6` so, `MnO_(2)` is oxidised to `K_(2)MnO_(4)` ( purple green ) by atmospheric oxygen in KOH medium.
`2MnO_(2)+4KOH+O_(2)rarrunderset(("purple"))(2K_(2)MnO_(4))+2H_(2)O`
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