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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
Question
Can the following reaction,
$\text{Cr}_{2}\text{O}^{2-}_7 + \text{H}_{2}\text{O}\rightleftharpoons 2\text{CrO}^{2-}_{4} + 2\text{H}^{+}$
be regarded as a redox reaction?
✓

Answer

In this reaction, oxidation number of Cr in $\text{Cr}_{2}\text{O}^{2-}_{4}$ is +6 and oxidation number of Cr in $\text{Cr}_{2}\text{O}^{2-}_{4}$is + 6. Since, during the reaction, the oxidation number of Cr has neither decreased nor increased, therefore, the above reaction is not a redox reaction.

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