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Which of the following changes requires a reducing agent?

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${CrO}_{4}^{2 -} ⟶ {Cr}_{2} O_{7}^{2 -}$

$\begin{array}{l} H_{3} {AsO}_{3} ⟶ {HAsO}_{4}^{2 -} \end{array}$

${BrO}_{3}^{⊝} {⟶ BrO}^{⊖}$

$\begin{array}{l} Al (OH)_{3} ⟶ {[Al (OH)_{4}^{}]}^{⊖} \end{array}$

answer is B.

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Detailed Solution

$\begin{array}{lr} 4 e^{-} + {BrO}_{3}^{⊖} ⟶ {BrO}^{⊖} \\ x - 6 = - 1 x - 2 = - 1 \\ x = 5 x = + 1 \end{array}$

the reaction undergoes reduction, i.e., it acts as oxidising agent, so it requires a reducing agent

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