When `KMnO_4` is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime bec

When `KMnO_4` is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime because
A. `Mn^(2+)` acts as autocatalyst
B. `CO_(2)` is formed as product
C. Reaction is exothermic
D. `MnO_(4)^(-)` catalyses the reaction

When `KMnO_4` is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime because

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