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Which one among the following pairs of ions cannot be separated by $H_2S$ in dilute hydrochloric acid?

(a) $Bi^{3-}, Sn^{4+}$
(b) $Al^{3+}, Hg^{2+}$
(c) $Zn^{2+}, Cu^{2+}$
(d) $Ni^{2+}, Cu^{2+}$
Can you answer this question?

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Answer: $Bi^{3-}, Sn^{4+}$
$Bi^{3-}$ and $Sn^{4+}$ belong to III group and thus cannot be separated by group III reagent ($H_2S$ in dilute Hydrochloic Acid).
answered Jan 26, 2014 by mosymeow_1

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