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Q.

In neutral or alkaline solution, ${MnO}_{4}^{-}$ oxidises thiosulphate to:

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a

$S_{2} O_{8}^{2 -}$

b

${SO}_{4}^{2 -}$

c

$S_{2} O_{7}^{2 -}$

d

${SO}_{3}^{2 -}$

answer is D.

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Detailed Solution

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$8 {MnO}_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to_{alk . solution}^{neutral or} 8 {MnO}_{2} + 6 {SO}_{4}^{2 -} + 2 {OH}^{-}$

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