Question

when Mno2 fused with potassium hydroxide coloured compound is formed the product and its colour is

write reaction too

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Answer 1

It is prepared by fusion of pyrolusite , MNo2 koh in the presence of an oxidising agent like kno3. this producer's the dark potassium manganate kn2, MNo4 which disproportionate in a neutral or acidic solution to get purple permanganate .

2MNo2 + 4KoH + o2= k2 MNo4 +2H2o

3MNo4 + 4H + = 2MNo4 + MNo2 + 2H2o

Commercially, it is prepared by alkaline oxidative fusion of MnO2 followed by electrolytic oxidation of manganate .(V|).

fused with koh

MnO2 ===============. MnO2

oxidised with air kno3

electrolytic oxidation

MnO2===================. MnO4

4 in alkaline solution permanganate.