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Some potassium permaganate taken in a te...

Some potassium permaganate taken in a test tube and heat it. Insert a glowing splinter in to the test tube.
a) What do you observe?
b) Reason behind this?
c)Complete the equation:
`2KMnO_4 rarr K_2MnO_4 + …............ + …...............`

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a) The glowing splinter burns into flame.
b) Oxygen gas is produced.
c) .2KMnO_4 rarr K_2MnO_4 + MnO_2 + O_2.
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