Which one of the following reactions does not involve either oxidation

1.	Which one of the following reactions does not involve either oxidation or reduction
Answer» `VO_(2)^(+) to V_(2)O_(3)` `Na to Na^(+)` `CrO_(4)^(2-) to Cr_(2)O_(7)^(2-)` `Zn^(2+) to Zn` Answer :C

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