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

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

(a) VO2+ → V2O3

(b) Na → Na+

(c) CrO42- → Cr2O72-

(d) Zn2+ → Zn

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Correct option is (c) CrO42- → Cr2O72-

No change in Ox. No. (+6) of Cr.

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