Which reaction does not involve either oxidation or reduction?
Correct answer: C. CrO₄²⁻ → Cr₂O₇²⁻
- A. VO²⁺ → V₂O₃
- B. Na → Na⁺
- C. CrO₄²⁻ → Cr₂O₇²⁻
- D. Zn²⁺ → Zn
Explanation
In both the chromate (CrO₄²⁻) and dichromate (Cr₂O₇²⁻) ions, the oxidation state of chromium is +6. This reaction is a condensation reaction, not a redox reaction, as no element changes its oxidation state.
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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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