On addition of small amount of KMnO(4) t...

On addition of small amount of `KMnO_(4)` to concentrated `H_(2)SO_(4)`, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following

`Mn_(2)O_(3)`

`MnSO_(4)`

`Mn_(2)O_(7)`

`MnO_(2)`

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