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

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

  1. A

    VO2+V2O3

  2. B

    Na Na+

  3. C

    CrO42- Cr2O72-  

  4. D

    Zn+2 Zn

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    Solution:

    In option (A) the vanadium compound VO2+ (+5) is reduced to V2O3 (+3).

    In option (B) the elemental sodium is oxidized to sodium ion.

    In option (C) the oxidation state of chromium (Cr) in CrO42- and Cr2O72- is +6. So chromium does not involve in either oxidation or reduction.

    In option (D) the zinc ion is reduced to elemental zinc.

    Therefore option (C) is correct.

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