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Copper II Chloride

The reagents ...

Question

The reagent(s) that can selectively precipitate $S^{2 -}$ from a mixture of $S^{2 -}$ and $S O_{4}^{2 -}$ in aqueous solution is/are:

C u C l_{2}

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B a C l_{2}

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P b (O O C C H_{3})_{2}

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N a_{2} [F e (C N)_{5} N O]

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Solution

The correct option is A $C u C l_{2}$
The reagent that can selectively precipitate $S^{2 -}$ and $S O_{4}^{2 -}$ in aqueous solution is $C u C l_{2}$

$S^{2 -} + C u C l_{2} \to C u S ↓ + 2 C l^{-}$

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