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:

Question

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Hydrogen peroxide (H2O2) in an alkaline medium (NH4OH) acts as a powerful oxidizing agent. Step 2: When arsenic(III) sulfide (As2S3) is treated with this mixture, the arsenic(+3) is oxidized to its highest oxidation state (+5), forming arsenate ions (AsO43-), while sulfide is oxidized to sulfate. Step 3: Thus, the species formed containing arsenic is the arsenate ion, AsO43-, which corresponds to option (b).

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