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Oxygen gas can be prepared from solid KM...

Oxygen gas can be prepared from solid `KMnO_4` by

A

Strongly heating the solid

B

Treating the solid with `H_(2)` gas

C

Dissolving the solid in dil. `H_(2)SO_(4)`

D

Dissolving the solid in dil. `HCl`

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The correct Answer is:
A
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