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
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The correct Answer is:
A
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