Question

Is $Cr_{2}O_{7}^{2-}+H_{2}O \rightleftharpoons 2CrO_{4}^{2-}+2H^{+}$ a redox reaction?

Answer 1

$Cr_{2} O_{7}^{2-} + H_{2}O \rightleftharpoons 2CrO_{4}^{2-} + 2H^{+}$

This given reaction is not a redox reaction.

Oxidation Number of Cr in$Cr_{2} O_{7}^{2-}$ = + 6

Oxidation Number of Cr in $2CrO_{4}^{2-}$  = + 6  

Since, the oxidation number of Cr is the same in both the product and the reactant side of the equation. The above reaction is not a redox reaction.