On addition of small amount of $\ce{KMnO_4}$ to concentrated $\ce{H_2SO_4},$ a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
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$\ce{KMnO_4}$ reacts with conc. $\ce{H_2SO_4}$ as:
$\ce{2KMnO_4 + 2H_2SO_4 \rightarrow Mn_2O_7 + 2KHSO_4 + H_2O}$
$\ce{Mn_2O_7}$ is highly explosive in nature.
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