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When KMnO(4) solution is added to oxalic...

When `KMnO_(4)` solution is added to oxalic acid solution , the decolourisation is slow in the beginning but becomes instantaneous after some time because

A

`CO_(2)` is formed as the product

B

Reaction is exothermic

C

`MnO_(4)^(-)` catalyses the reaction

D

`Mn^(2+)` acts as autocatalyst

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The correct Answer is:
D
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