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$S_{2} O_{3}^{2 -}$ and $S^{2 -}$ cannot be distinguished by :

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$Pb (OAc)_{2}$ solution

${BaCl}_{2}$ solution

Acidic ${KMnO}_{4} s$ solution

dil. HCl solution

answer is C.

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Detailed Solution

$S_{2} O_{3}^{2 -}$ and $s^{2 -}$ can be differentiated by the acidic ${KMnO}_{4}$ solution.

Potassium permanganate is an oxidizing compound having bactericidal, deodorizing, and astringent effects. Its properties help to differentiate different sulphate and their ions.

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