The only cations present in a slightly acidic solution are \( \mathrm{Fe}^{3+}, \mathrm{Zn}^{2+}...

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The only cations present in a slightly acidic solution are \( \mathrm{Fe}^{3+}, \mathrm{Zn}^{2+} \) and \( \mathrm{Cu}^{2+} \). The reagent that when added in excess to this solution would identifiy and separate \( \mathrm{Fe}^{3+} \) in one step is -
(A) \( 2 \mathrm{M} \mathrm{HCl} \)
(B) \( 6 \mathrm{M} \mathrm{NH}_{3} \)
(C) \( 6 \mathrm{M} \mathrm{NaOH} \)
(D) \( \mathrm{H}_{2} \mathrm{~S} \) gas
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