When $MnO_2$ is fused with $\text{KOH}$ in the presence of air, a coloured compound is formed, the product and its colour is:
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The reaction between $MnO_{2}$ and $\text{KOH}$ in presence of air is given as:$\ce{2MNO_{2 }+ 4KOH + O_2 \rightarrow 2K_{2}MnO_4 + 2H_2O} ($potassium manganate$)$ The $\ce{K_2MnO_4}$ formed is dark green in colour.
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