####31. The reagents, $NH _4 Cl$ and aqueous $NH _3$ will precipitate
(a) $Ca^{2+}$
(b) $Al^{3+}$
(c) $Bi^{3+}$
(d) $Mg^{2+}$
(e) $Zn^{2+}$
Correct Answer: 31. (b,c)
Solution:
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