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Which of the following ions can be separated by using \( \mathrm{NH}_{4} \mathrm{Cl} \) and \( \mathrm{NH}_{4} \mathrm{OH} \) -
(A) \( \mathrm{Fe}^{3+} \) and \( \mathrm{Cr}^{3+} \)
(B) \( \mathrm{Cr}^{3+} \) and \( \mathrm{Co}^{2+} \)
(C) \( \mathrm{Cr}^{3+} \) and \( \mathrm{Al}^{3+} \)
(D) \( \mathrm{Al}^{3+} \) and \( \mathrm{Ba}^{2+} \)
\( P \)
W.
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