Which one of the following reactions does not | vedclass

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(C) In the reaction $CrO_4^{2-} 	o Cr_2O_7^{2-}$,we calculate the oxidation state of $Cr$ in both species: For $CrO_4^{2-}$: $x + 4(-2) = -2 \implies

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$CrO_4^{2-} 	o Cr_2O_7^{2-}$

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(C) In the reaction $CrO_4^{2-} 	o Cr_2O_7^{2-}$,we calculate the oxidation state of $Cr$ in both species: For $CrO_4^{2-}$: $x + 4(-2) = -2 \implies x = +6$. For $Cr_2O_7^{2-}$: $2x + 7(-2) = -2 \implies 2x = 12 \implies x = +6$. Since the oxidation state of $Cr$ remains $+6$ in both reactants and products,there is no change in the oxidation number. Therefore,this reaction involves neither oxidation nor reduction.

Which one of the following reactions does not involve either oxidation or reduction?

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