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  4. 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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Q. In the titration of $KMnO _4$ and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is ______

JEE MainJEE Main 2022The d-and f-Block Elements

Solution:

Oxidation state of carbon changes from $+3$ to $+4$.
$ 2 KMnO _4+5 H _2 C _2 O _4+3 H _2 SO _4 \text { (dil.) } \rightarrow $
$ K _2 SO _4+2 MnSO _4+10 CO _2+8 H _2 O$