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Which of the following reactions does not involve either oxidation or reduction ?A. `VO_(2)^(+) rarr V_(2)O_(3)`B. `Na rarr Na^(+)`C. `CrO_(4)^(2-) rarr Cr_(2)O_(7)^(2-)`D. `Zn^(2+) rarr Zn` |
Answer» Correct Answer - C `{:(overset(**)(C)rO_(4)^(2-),,overset(**)(C)r_(2)O_(7)^(2-)),(x+[(-2)xx4]=2,,2x+(-2)xx7=-2),(x=8-2=+6,,2x=14-2=12),(,,x=12/2=+6):}` In this reaction oxidation and reduction are not involved because there is no change in oxidation number. |
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