Ncert Exercises & Solutions

When $K M n O_{4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because

1. $C O_{2}$ is formed as the product

2. Reaction is exothermic

3. $M n O_{4}^{-}$ catalyses the reaction

4. $M n^{2 +}$ acts as autocatalyst

When KMn

O_{4}

solution is added to oxalic acid solution, the decolourisation is siow in the beginning but becomes instantaneous after some time because

M n^{2 +}

acts as autocatalyst.

Reduction half $M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O \times 2$

Oxidation half $C_{2} O_{4}^{2} \to 2 C O_{2} + 2 e^{-} \times 5$

Overall equation $2 M n O_{4}^{-} + 16 H^{+} + 5 C_{2} O_{4}^{2 -} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$

End point of this reaction Colourless to light pink

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