Oxygen gas can be prepared from solid $K M n O_{4}$ by

treating the solid with

H_{2}

gas

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strongly heating the solid

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dissolving the solid in dilute

H_{2} S O_{4}

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dissolving solid in dil HCl

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Solution

The correct option is B strongly heating the solid
$K M n O_{4} Δ \to M n O_{2} + K_{2} M n O_{4} + O_{2}$
Therefore, oxygen gas can be prepared fron solid $K M n O_{4}$ by strongly heating the solid.

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Similar questions

H_{2} S O_{4}

H_{2} S O_{4}

X

H C l

X

	Appearance	Reactions with dilute $H C l$	Reaction with Dilute $H N O_{3}$
Unknown metal 1	Dull grey solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
Unknown metal 2	Solid, lustrous, smooth silver-grey surface	No reaction	Dissolved with bubbles of orange gas

H C l

	Appearance	Reaction with dilute $H C l$	Reaction with dilute $H N O_{3}$
Unknown metal #1	Dull gray solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
Unknown metal #2	Solid; lustrous, smooth silver-gray surface	No reaction	Dissolved with bubbles of orange gas

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