When $\mathrm{KMnO}_{4}$ is added to oxalic acid, the decolourisation is slow in the beginning but becomes…

When $\mathrm{KMnO}_{4}$ is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime because
  1. $\mathrm{Mn}^{2+}$ acts as autocatalyst.
  2. $\mathrm{CO}_{2}$ is formed as the product.
  3. Reaction is exothermic.
  4. $\mathrm{MnO}_{4}^{-}$ catalyses the reaction.

Solution

Little bit acid is required for reaction $\therefore \mathrm{Mn}^{2+}$ acts as autocatalyst. ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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