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  4. When a small amount of KMnO4 is added to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Compound may be :

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Q. When a small amount of $KMnO_4$ is added to concentrated $H_2SO_4$, a green oily compound is obtained which is highly explosive in nature. Compound may be :

JEE MainJEE Main 2013The d-and f-Block Elements

Solution:

$KMnO_4$ reacts with $H_2SO_4$ to form $Mn_2O_7$ which is highly explosive substance.
$2KMnO_4 + H_2SO_4 \rightarrow K_2SO_4 + Mn_2O_7 + H_2O$