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Which of the following ions can be separated by using \( \mathrm{H}_{2} \mathrm{~S} \) in the presence of dilute \( \mathrm{HCl} \) ?
(A) \( \mathrm{Cu}^{2+} \) and \( \mathrm{Co}^{2+} \)
(B) \( \mathrm{Pb}^{2+} \) and \( \mathrm{Ni}^{2+} \)
(C) \( \mathrm{Hg}^{2+} \) and \( \mathrm{Cu}^{2+} \)
(D) \( \mathrm{Cu}^{2+} \) and \( \mathrm{Bi}^{3+} \)
\( P \)
W.
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