When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because

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When $K M n O_{4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because

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Reaction is exothermic

$M n^{2 +}$ acts as autocatalyst.

$C O_{2}$ is formed as the product

$M n O_{4}^{-}$ catalyses the reaction

answer is D.

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