Which reaction does not involve either in oxidation or reduction?
Correct answer: C. CrO42- → Cr2O72-
- A. VO2+ → V2O3
- B. Na → Na+
- C. CrO42- → Cr2O72-
- D. Zn2+ → Zn
Explanation
The correct answer is option C: CrO42- → Cr2O72-. In this reaction, there is no change in the oxidation state of chromium, indicating neither oxidation nor reduction occurs. This is merely a rearrangement of atoms. Option A involves reduction of vanadium, Option B involves oxidation of sodium, and Option D involves reduction of zinc, as indicated by changes in their oxidation states.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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