Which of the following reactions does not involve either oxidation or reduction?
VO2+→V2O3VO_2^+ \rightarrow V_2O_3VO2+→V2O3
Na→Na+Na \rightarrow Na^+Na→Na+
CrO42−→Cr2O72−CrO_4^{2-} \rightarrow Cr_2O_7^{2-}CrO42−→Cr2O72−
Zn2+→ZnZn^{2+} \rightarrow ZnZn2+→Zn
(C) CrO42−→Cr2O72−CrO_4^{2-} \rightarrow Cr_2O_7^{2-}CrO42−→Cr2O72−
Explanation:
