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Redox Reactions

A 0.1 M sol...

Question

A $0.1$ M solution of a certain cation will form a precipitate with $0.1$ M solution of all these anions; $O H^{-}, C O_{3}^{- 2}, C l^{-}, S O_{4}^{2 -}$ . Which cation fits this description?

B a^{2 +}

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F e^{2}

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M g^{2 +}

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P b^{2 +}

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Solution

The correct option is D $P b^{2 +}$
Reactions:
$P b^{2} + O H^{-} \to P b (O H)_{2}$ (white); $P b^{2} + C O_{3}^{2 -} \to P b C O_{3}$ (white)
$P b^{2 +} + 2 C I \to P b C I_{2}$ (white); $P b^{2 +} (a q) + S O_{4}^{2} \to P b S O_{4}$ (white)

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[K_{1} H_{2} S = 10^{- 7}, K_{2} H_{2} S = 10^{- 14}, K_{s p} P b S = 3 \times 10^{- 29} K_{s p} N i S = 3 \times 10^{- 19} . K_{s p} Z n S = 10^{- 25}]

0.1

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M g (O H)_{2} = 1 \times 10^{- 11}

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