When an acid solution of oxalic acid at 80°C is titrated with KMnO4 solution, the first few drops of KMnO4 are decoloured slowly but decolourisation occurs fast later. This isbecause

In the oxidation of oxalic acid by potassium permanganate in acidic medium, manganous ion (Mn2+) formed in the later stages decolourises KMnO4 fast and functions as an autocatalyst.

When an acid solution of oxalic acid at 80°C is titrated with KMnO4 solution, the first few drops of KMnO4 are decoloured slowly but decolourisation occurs fast later. This isbecause

In the oxidation of oxalic acid by potassium permanganate in acidic medium, manganous ion (Mn2+) formed in the later stages decolourises KMnO4 fast and functions as an autocatalyst.

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When an acid solution of oxalic acid at 80°C is titrated with KMnO₄ solution, the first few drops of KMnO₄ are decoloured slowly but decolourisation occurs fast later. This is
because

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Of increase in the concentration of CO₂ formed

Both Mn²⁺ and K⁺ ions act as auto catalyst

One of the products Mn⁺² acts as auto catalyst

KMnO₄catalyses the reaction at the later stages

answer is B.

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Detailed Solution

In the oxidation of oxalic acid by potassium permanganate in acidic medium, manganous ion (Mn²⁺) formed in the later stages decolourises KMnO₄ fast and functions as an autocatalyst.

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