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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- ??
C2O42- ---> 2CO2 + 2e- (a)
Mno4- + 8H+ + 5e- ---> Mn2+ + 4H2O (b)
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multiply 5 times A and 2 times B gives
5 C2O42- + 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
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