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  4. A student accidentally added conc. H2SO4 to potassium permanganate and it exploded due to the formation of an explosive which is

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Q. A student accidentally added conc. $ H_2SO_4 $ to potassium permanganate and it exploded due to the formation of an explosive which is

AMUAMU 2010The d-and f-Block Elements

Solution:

When concentrated sulphuric acid is added to potassium permanganate, a mild explosive manganese heptoxide is obtained
$2KMnO_{4}+H_{2}SO_{4} \to Mn_{2}O_{7}+K_{2}SO_{4}+H_{2}O$
Note $Mn_{2}O_{7}$ is a powerful oxidising agent and combustible substance Wood, cotton catches fire readily when comes in contact of it