C2O42- can be oxidised to CO2 by MnO4- in acidic as well as basic medium. What is ratio of mole of MnO4- used per mole of C2O42- ??

C₂O₄^2-                     ---> 2CO₂  + 2e^{-                           (a)}

Mno₄^- + 8H⁺  + 5e^-    ---> Mn²⁺  + 4H₂O                 (b)

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multiply 5 times A and 2 times B gives

5 C₂O₄^2-    +  2 Mno₄^-     + 16 H⁺             ---> 10 CO₂  + 2 Mn²⁺  + 8 H₂O

^{2 moles of MnO4 - per 5 moles of C2O4 2-}

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^regards

^Ramesh