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Byju's Answer

Standard XII

Chemistry

Nitrogen

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 $C u C l_{2}$
$S^{2 -} + C u C l_{2} \to C u S ↓ (black ppt) S O_{4}^{2 -} + C u C l_{2} \to C u S O_{4} (soluble)$
Thus, $C u C l_{2}$ selectively precipitates $S^{2 -} .$

$S^{2 -} + B a C l_{2} \to B a S (soluble) S O_{4}^{2 -} + C u C l_{2} \to B a S O_{4} ↓ (white ppt)$
Thus, $B a C l_{2}$ selectively precipitates $S O_{4}^{2 -} .$

$S^{2 -} + P b^{2 +} \to P b S ↓ (black ppt) S O_{4}^{2 -} + P b^{2 +} \to P b S O_{4} ↓ (white ppt)$
$S^{2 -} and S O_{4}^{2 -}$ both are precipitated.

$S^{2 -} + N a_{2} [F e (C N)_{5} N O] Sodium nitroprusside \to N a_{2} [F e (C N)_{5} N O S] Violet colour But no colour with S O_{4}^{2 -} .$

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Similar questions

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The reagent(s) that can selectively precipitate S2− from a mixture of S2− and SO2−4 in aqueous solution is(are):

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):