Chemistry - Redox Reactions Question with Solution | TestHub

$\stackrel{+2}{\text{C}}{\text{rO}}_{\text{4}}^{\text{2}-}\to \stackrel{+2}{\text{C}}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}^{\text{2}-}$
In this reaction oxidation and reduction are not involved because there is no change in oxidation number.