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Which of the following mixtures can be separated by using excess \( \mathrm{NH}_{3} \) solution ?
(a) \( \mathrm{Bi}^{3+} \) (aq.) and \( \mathrm{Al}^{3+} \) (aq.)
(b) \( \mathrm{Al}^{3+} \) (aq.) and \( \mathrm{Zn}^{2+} \) (aq.)
(c) \( \mathrm{Hg}^{2+} \) (aq.) and \( \mathrm{Pb}^{2+} \) (aq.)
(d) \( \mathrm{Cu}^{2+} \) (aq.) and \( \mathrm{Cd}^{2+} \) (aq.)
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