When \( \mathrm{KMnO}_{4} \) solution is added to hot oxalic acid solution, the decolorisation i...

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When \( \mathrm{KMnO}_{4} \) solution is added to hot oxalic acid solution, the decolorisation is slow in the beginning but becomes instantaneous after some time. This is because :
(a) \( \mathrm{Mn}^{2+} \) acts as auto catalyst
(b) \( \mathrm{CO}_{2} \) is formed
(c) Reaction is exothermic
(d) \( \mathrm{MnO}_{4}^{-} \)catalysis the reaction
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