Answer:
Oxidation number of Cr in \[C{{r}_{2}}O_{7}^{2-}=+6\]
Oxidation number of Cr in \[C{{r}_{2}}O_{4}^{2-}=+6\]
Since during this reaction, the oxidation number of Cr has neither decreased nor increased, therefore, the above reaction cannot be regarded as a redox reaction.
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