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Effect on Indicators by Acids and Bases

K 4 [ Fe CN ...

Question

$K_{4} [{F e (C N)}_{6}]$ can be used to detect some ions out of ${C d}^{2 +}, {C u}^{2 +}, {Z n}^{2 +}, {F e}^{3 +}, {P b}^{2 +}$ and ${B i}^{3 +}$ . Excluded ions are :

{F e}^{3 +}, {B i}^{3 +}, {P b}^{2 +}

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{C u}^{2 +}, {Z n}^{2 +}, {B i}^{3 +}

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{B i}^{3 +}, {P b}^{2 +}

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{F e}^{3 +}, {P b}^{2 +}

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Solution

The correct option is C ${B i}^{3 +}, {P b}^{2 +}$
$K_{4} [{F e (C N)}_{6}]$ can be used to detect some ions out of ${C d}^{2 +}, {C u}^{2 +}, {Z n}^{2 +}, {F e}^{3 +}, {P b}^{2 +} a n d {B i}^{3 +}$ . Excluded ions are ${B i}^{3 +}, {P b}^{2 +}$ .
For example Copper(II) ions react with potassium ferrocyanide to form red brown precipitate of cupric ferrocyanide.
$K_{4} [F e (C N)_{6}] + 2 C u S O_{4} \to C u_{2} [F e (C N)_{6}] red brown ppt + 2 K_{2} S O_{4}$

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Similar questions

H_{2} S

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K_{4} [{F e (C N)}_{6}]

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E_{(P b^{2 +} | P b)}^{⊖} = - 0.126 V, E_{(Z n^{2 +} | Z n)}^{⊖} = - 0.763 V

25^{\circ} C

Z n | Z n^{2 +} (1 M) | | P b^{2 +}

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2.5 \times 10^{- x} M

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