(1986,1 M)
(a) $Bi^{3+}, Sn^{4+}$
(b) $Al^{3+}, Hg^{2+}$
(c) $Zn^{2+}, Cu^{2+}$
(d) $Ni^{2+}, Cu^{2+}$
Correct Answer: 20. (a)
Solution:
Both $Bi^{3+}$ and $Sn^{4+}$ belongs to same analytical group II.
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