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When KMnO4 is added to oxalic acid, the ...

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 the oproduct

C

Reaction is exothermic

D

`MnO_4^(ɵ)` catalyses the reaction.

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The correct Answer is:
a
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