25.0cm3 of a 0.0500 m solution of sodium oxalate reacted with 24.7 cm3 of a solution of KMnO4, C, in the presence of excess H2SO4. 25.0 cm' of a O250 m solution of N2H4 when treated with an excess of alkaline [Fe(CN)6J3~ solution gave |Fe(CN)6l4- and a product D. The [Fe(CN)fi]4- formed was reoxidized to [Fe(CN)6J by 24.80cm3 of solution C, and the presence o f D did not influence this determination. What can you deduce about the identity of D?
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