\( \mathrm{Fe}(\mathrm{OH})_{3} \) and \( \mathrm{Cr}(\mathrm{OH})_...

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\( \mathrm{Fe}(\mathrm{OH})_{3} \) and \( \mathrm{Cr}(\mathrm{OH})_{3} \mathrm{ppt} \), are separated by:
P
(1) aq. \( \mathrm{NH}_{3} \)
(2) \( \mathrm{HCl} \)
W
(3) \( \mathrm{NaOH} / \mathrm{H}_{2} \mathrm{O}_{2} \)
(4) \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
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