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k2cr2o7 oxidation number of cr
calculate oxidation state of cr in k2cr2o7
oxidation number of k in k2cr2o7
oxidation number of chromium in k2cr2o7
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oxidation state of k2cr2o7
oxidation number of cr in cr2o7
oxidation state of each element in k2cr2o7
oxidation number of cr2o7
oxidation number of cr2 in cr2o7-2
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