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NEET levelSingle correct optionDifficulty 1 of 3sc064

In the titration of oxalic acid with acidified $KMnO X_{4}$ at about 330 K the decolourisation is slow at first and then becomes fast. This is due to

A $Mn X^{2 +}$ formed, which acts as an autocatalyst
B $K X^{+}$ ions present in the solution
C $CO X_{2}$ evolved acting as a catalyst
D $SO X_{4} X^{2 -}$ ions from the acid

Answer: A

Mn X^{2 +}

is a product that catalyses its own formation (autocatalysis), so the rate rises after an induction period.

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