Among the given options, what crystals are used for the preparation of oxygen in the classroom?

$K M n O_{4}$

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$K_{2} M n O_{4}$

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$M n O_{2}$

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$K_{3} M n O_{4}$

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Solution

The correct option is A
$K M n O_{4}$

A dry boiling tube and potassium permanganate crystals are used for the preparation of oxygen in the classroom. The potassium permanganate crystals are taken in a dry boiling tube and heated. Potassium permanganate crystals decompose to form potassium manganate, manganese oxide and oxygen.

$2 K M n O_{4} + H e a t$ $\to$ $K_{2} M n O_{4} + M n O_{2} + O_{2}$

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K C l O_{3}

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