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

(i) CO2 is formed as the product.

(ii) Reaction is exothermic.

(iii) MnO4 catalyses the reaction.

(iv) Mn2+ acts as autocatalyst.

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(iv) Mn2+ acts as autocatalyst.

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