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Potassium ferrocyanide is used in the detection of

(a) $Fe^{2+}$ ions
(b) $Fe^{3+}$ ions
(c) $Ca^{2+}$ ions
(d) $Cd^{2+}$ ions
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Answer: $Fe^{3+}$ ions
$4FeCl_3 + 3K_4[Fe(CN)_6] \longrightarrow Fe_4[Fe(CN)_6]_3 $ (Prussian blue Ferri ferrocyanide) $+ 12KCl$
answered Feb 1, 2014 by mosymeow_1

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