Question

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

Answer 1

$16H^++2MnO^-_4+5C_2O^{2-}_4→10CO_2+2Mn_{2+}+8H_2O$
During titration of oxalic acid by KMnO4, oxalic acid converts into CO2.
∴ Change in oxidation state of carbon = 1