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Q.

In the titration of KMnO4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is_____

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answer is 1.

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Detailed Solution

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Oxidation state of carbon changes from +3 to +4.

2KMnO4+5H2C2O4+3H2SO4( dil. )→                  K2SO4+2MnSO4+10CO2+8H2O

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