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Match List-I with List-II List-I Cations A. Pb2+, Cu2+ B. Al3+, Fe3+ C. Co2+, Ni2+ D. Ba2+, Ca2+ List-II Group reagents I. H2S gas in presence of dilute HCl II. (NH4)2CO3 in presence of NH4OH III. NH4OH in presence of NH4Cl IV. H2S in presence of NH4OH Correct match is

1. (1) A → i; B → iii; C → iv; D → ii
2. (2) A → i; B → iii; C → ii; D → iv
3. (3) A → iv; B → ii; C → iii; D → i
4. (4) A → iii; B → i; C → iv; D → ii

Correct answer: (1) A → i; B → iii; C → iv; D → ii

Solution

The correct matches align the cations with their respective group reagents based on their solubility and precipitation reactions. For example, Pb2+ and Cu2+ react with H2S in dilute HCl to form insoluble sulfides, while Al3+ and Fe3+ are best identified using NH4OH in the presence of NH4Cl.

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