In alkaline medium CrO 4 2 − oxidizes S 2 O 3 2 − to SO 4 2 − and itself reduces to CrO 2 1 − . In this reaction what is the ratio of coefficients of CrO 4 2 − and O H is

Question

In alkaline medium CrO 4 2 − ​ oxidizes S 2 ​ O 3 2 − ​ to SO 4 2 − ​ and itself reduces to CrO 2 1 − ​ . In this reaction what is the ratio of coefficients of CrO 4 2 − ​ and O H is

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Question Explanation:

Balancing a redox reaction in a basic medium to find coefficient ratios.

Concept: Balancing Redox Reactions.

Balance the given reaction in basic medium as $8 CrO_{4}^{2 -} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 CrO_{2}^{-} + 6 SO_{4}^{2 -} + 2 OH^{-}$ so, $\frac{rate of consumption of CrO _{4}^{2 -}}{rate of formation of OH ^{-}} = \frac{8}{2} = 4$

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