The only cations present in a slightly acidic solution are Fe3+, Zn2+ and Cu2+. The reagent that when added in excess to this solution would identify and separate Fe3+ in one step, is

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2 M HCl

6 M NH3

6 M NaOH

H2S gas

answer is B.

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Detailed Solution

Fe3++Zn2++Cu2+→6MNH3Fe(OH)3(Brown ppt)↓+ZnNH34soluble2++CuNH34soluble2+

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