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The reagent $NH_4Cl$ and aqueous $NH_3$ will precipitate

(a) $Ca^{2+}$
(b) $Al^{3+}$
(c) $Mg^{2+}$
(d) $Zn^{2+}$
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Answer: $Al^{3+}$
Group reagent for group III ($NH_4Cl$ and $NH_4OH$) can precipitate group I, II and III and not of any subsequent groups. As such only $Al^{3+}$ ions will be precipitated.
answered Feb 1, 2014 by mosymeow_1

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