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Q.

During the oxidation of arsenite to arsenate ion in alkaline medium, the number of moles of hydroxide ions involved per mole of arsenite ion are

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a

2

b

3

c

2/3

d

None of these

answer is A.

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Detailed Solution

$\overset{(3 +)}{As} O_{3}^{- 3} \overset{}{\to} \overset{(+ 5)}{As} O_{4}^{- 3} {AsO}_{3}^{- 3} + 2 {OH}^{-} \to {AsO}_{4}^{- 3} + H_{2} O$

In the presence of oxidizing agent $({KMnO}_{4})$

2 moles of ${OH}^{-}$ is produced in basic medium

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