####20. Which one amongst the following pairs of ions cannot be separated by $H _2 S$ in dilute $HCl$ ?
(a) $Bi^{3+}, Sn^{4+}$
(b) $Al^{3+}, Hg^{2+}$
(c) $Zn^{2+}, Cu^{2+}$
(d) $Ni^{2+}, Cu^{2+}$
$(1986,1 M)$
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