In the titration of KMnO 4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is

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The balanced equation of potassium permanganate and oxalic acid reaction in acidic medium is shown below.
$2 K \overset{+ 7}{Mn} O_{4} + 5 H_{2} \overset{+ 3}{C_{2}} O_{4} + 3 H_{2} {SO}_{4} (dil .) \to K_{2} {SO}_{4} + 2 \overset{+ 2}{M} {nSO}_{4} + 10 \overset{+ 4}{C} O_{2} + 8 H_{2} O$
The initial oxidation state of carbon in the oxalic acid is $+ 3$ . The oxidation state of carbon at the end point is $+ 4$ (in carbon dioxide). Hence, the change in oxidation state of carbon at the end point is 1.

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