Which of the following mixture of cations can be separated by adding excess \( \mathrm{NH}_{3} \...

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Which of the following mixture of cations can be separated by adding excess \( \mathrm{NH}_{3} \) solution?
(A) \( \mathrm{Zn}^{2+}, \mathrm{Mn}^{2+} \)
(B) \( \mathrm{Zn}^{2+}, \mathrm{Cd}^{2+} \)
(C) \( \mathrm{Zn}^{2+}, \mathrm{Pb}^{2+} \)
(D) \( \mathrm{Zn}^{2+}, \mathrm{Cu}^{2+} \)
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