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by assuming oxalate ion. Oxalate is reducing agent and consist of2 carbon and 4oxygen , Oxygen has oxidation No:-2 and in Oxalate it becomes 4*-2=-8

and carbon has oxidation No:+3 also 2 carbon present in the oxalate ion therefor equal to =+6.

C2O4 -2

+3*2-2*4=-2

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