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Match List-I with List-II: LIST-I (Precipitating reagent and conditions) A. NH4Cl + NH4OH B. NH4OH + Na2CO3 C. NH4OH + NH4Cl + H2S gas D. dilute HCl LIST-II (Cation) I. Mn2+ II. Pb2+ III. Al3+ IV. Sr2+ Choose the correct answer from the options given below :

1. (1) A-IV, B-III, C-II, D-I
2. (2) A-IV, B-III, C-I, D-II
3. (3) A-III, B-IV, C-I, D-II
4. (4) A-III, B-IV, C-II, D-I

Correct answer: (3) A-III, B-IV, C-I, D-II

Solution

The correct option matches the reagents and conditions with their respective cations based on their precipitation reactions. NH4OH reacts with Al3+ to form a precipitate, while Na2CO3 precipitates Sr2+. H2S gas in the presence of NH4Cl and NH4OH leads to the precipitation of Mn2+, and dilute HCl is known to precipitate Pb2+.

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