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Which of the following mixtures of ions in solution can be separated by using an \( \mathrm{NaOH} \) solution ?
(A) \( \mathrm{Fe}^{3+} \) and \( \mathrm{Pb}^{2+} \)
(B) \( \mathrm{Pb}^{2+} \) and \( \mathrm{Sn}^{2+} \)
(C) \( \mathrm{Zn}^{2+} \) and \( \mathrm{Sn}^{2+} \)
(D) \( \mathrm{Al}^{3+} \) and \( \mathrm{Cu}^{2+} \)
\( \mathrm{P} \)
W.
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