(1991, 1M)
(a) $Ca^{2+}$
(b) $Al^{3+}$
(c) $Bi^{3+}$
(d) $Mg^{2+}$
(e) $Zn^{2+}$
Correct Answer: 31. (b,c)
Solution:
Both $Al^{3+}$ and $Bi^{3+}$ are precipitated as their hydroxides.
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