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(C) In a redox reaction,the oxidation state of the central atom changes.$1$. In $VO_2^{+} \rightarrow V_2O_3$,the oxidation state of $V$ changes from

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$CrO_4^{2-} \rightarrow Cr_2O_7^{2-}$

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(C) In a redox reaction,the oxidation state of the central atom changes.$1$. In $VO_2^{+} \rightarrow V_2O_3$,the oxidation state of $V$ changes from $+5$ to $+3$ (Reduction).$2$. In $Na \rightarrow Na^{+}$,the oxidation state of $Na$ changes from $0$ to $+1$ (Oxidation).$3$. In $CrO_4^{2-} \rightarrow Cr_2O_7^{2-}$,the oxidation state of $Cr$ remains $+6$ in both species. Thus,there is no change in oxidation state.$4$. In $Zn^{2+} \rightarrow Zn$,the oxidation state of $Zn$ changes from $+2$ to $0$ (Reduction).Therefore,the conversion $CrO_4^{2-} \rightarrow Cr_2O_7^{2-}$ does not involve oxidation or reduction.

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

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