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oxidation number of c2
oxidation number of c2o4
c2o4 2- oxidation number
c oxidation number in c2o4-2
oxidation number of c3o2
oxidation number of c in ch2o
oxidation state of c2o4-2
oxidation state of c2o4
co2 oxidation number of c
oxidation number of carbon in c3o2
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