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In which of the following reactions, there is no change in oxidation state of the atoms involed?
(A) \( \mathrm{VO}_{2}^{+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3} \)
(B) \( \mathrm{Na} \rightarrow \mathrm{Na}^{+} \)
(C) \( \mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
(D) \( \mathrm{Zn}^{2+} \rightarrow \mathrm{Zn} \)
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