ChemistryWhich of the following reactions does not involve the change in oxidation state of metal?

Which of the following reactions does not involve the change in oxidation state of metal?

$\overset{+ 6}{Cr} O_{4}^{2 -} \to {\overset{+ 6}{Cr}}_{2} O_{7}^{2 -}$

Oxidation state of Cr from both sides of reaction is the same.

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