question_answer

Can the reaction, \[C{{r}_{2}}O_{7}^{2-}+{{H}_{2}}O\,\,\,\rightleftarrows \,2CrO_{4}^{2-}+2{{H}^{+}}\] be regarded as a redox reaction?

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.