When $M n O_{2}$ is fused with KOH in the presence of air, a coloured compound is formed, the product and its colour is :

K_{2} M n O_{4}

, dark green

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K M n O_{4}

, purple

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M n_{2} O_{3}

, brown

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M n_{3} O_{4}

, black.

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Solution

The correct option is B $K_{2} M n O_{4}$ , dark green
The reaction between MnO $_{2}$ and KOH in presence of air is given as:
$2 M N O_{2} + 4 K O H + O_{2}$ $\to$ $2 K_{2} M n O_{4} + 2 H_{2} O$
(potassium manganate)
The $K_{2} M n O_{4}$ formed is dark green in colour.

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When MnO2 is fused with KOH in the presence of air, a coloured compound is formed, the product and its colour is :

The correct option is B K2MnO4, dark greenThe reaction between MnO2 and KOH in presence of air is given as:2MNO2+4KOH+O2 → 2K2MnO4+2H2O (potassium manganate)The K2MnO4 formed is dark green in colour.

When $M n O_{2}$ is fused with KOH in the presence of air, a coloured compound is formed, the product and its colour is :

The correct option is B $K_{2} M n O_{4}$ , dark green
The reaction between MnO $_{2}$ and KOH in presence of air is given as:
$2 M N O_{2} + 4 K O H + O_{2}$ $\to$ $2 K_{2} M n O_{4} + 2 H_{2} O$
(potassium manganate)
The $K_{2} M n O_{4}$ formed is dark green in colour.