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When `MnO_(2)` 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

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Correct Answer - 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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