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Q.

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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a

Of increase in the concentration of CO2 formed

b

Both Mn2+ and K+ ions act as auto catalyst

c

One of the products Mn+2 acts as auto catalyst

d

KMnO4 catalyses 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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