Which of the following changes requires a reducing agent?

C r O_{4}^{2 -} ⟶ {C r}_{2} O_{7}^{2 -}

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B r O_{3}^{-} ⟶ B r O^{-}

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H_{3} A s O_{3} ⟶ H A s O_{4}^{2 -}

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A l {(O H)}_{3} ⟶ A l {(O H)}_{4}^{-}

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Solution

The correct option is D $B r O_{3}^{-} ⟶ B r O^{-}$
$B r O_{3}^{-} ⟶ B r O^{-}$
+5 +1 reduction is taking place.
$C r O_{4}^{2 -} ⟶ {C r}_{2} O_{7}^{2 -}$
+6 +6
$H_{3} A s O_{3} ⟶ H A s O_{4}^{2 -}$
+3 +5 oxidation is taking place.
$A l {(O H)}_{3} ⟶ A l {(O H)}_{4}^{-}$
+3 +3
Hence, a reducing agent is required for the second reaction.

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