Mark the correct statement out of the following

Options

A. Group I basic radicals precipitate as chlorides
B. Group IV basic radicals precipitate as sulphides
C. Group V basic radicals precipitate as carbonates
D. All of the above statements are correct

Answer

To solve the question, we need to analyze each statement regarding the basic radicals and their corresponding precipitates formed with specific reagents. Let's break down the statements one by one:

### Step-by-Step Solution:

1. **Statement 1**: "Group 1 basic radical precipitate as chloride."
- **Analysis**: In qualitative analysis, the basic radicals in Group 1 include Ag²⁺, Pb²⁺, and Hg₂²⁺. The reagent used to precipitate these ions is dilute hydrochloric acid (HCl). When HCl is added, the precipitates formed are AgCl, PbCl₂, and Hg₂Cl₂, which are indeed chlorides.
- **Conclusion**: This statement is **correct**.

2. **Statement 2**: "Group 4 basic radicals precipitate as sulphide."
- **Analysis**: The basic radicals in Group 4 include Zn²⁺, Ni²⁺, Mn²⁺, and Co²⁺. The reagent used for precipitation in this group is hydrogen sulfide (H₂S) in an ammonical medium. The precipitates formed are ZnS, NiS, MnS, and CoS, which are sulfides.
- **Conclusion**: This statement is **correct**.

3. **Statement 3**: "Group 5 basic radicals precipitate as carbonate."
- **Analysis**: The basic radicals in Group 5 include Ba²⁺, Ca²⁺, and Sr²⁺. The reagent used for precipitation in this group is ammonium carbonate (NH₄)₂CO₃. The precipitates formed are BaCO₃, CaCO₃, and SrCO₃, which are carbonates.
- **Conclusion**: This statement is **correct**.

4. **Final Statement**: "All of the above statements are correct."
- **Analysis**: Since all individual statements (1, 2, and 3) have been verified as correct, this statement is also true.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The correct answer is **Option D: All of the above statements are correct**.

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