Mark the correct statement :

Options

A. Group I basic radicals are precipitated as chlorides
B. Group IV basic radicals are precipitated as sulphides
C. Group V basic radicals are precipitated as carbonates
D. All the statement are correct.

Explanation

To solve the question "Mark the correct statement," we will analyze each statement regarding the precipitation of basic radicals in different groups.

### Step-by-Step Solution:

1. **Statement 1: Group 1 basic radicals are precipitated as chlorides.**
- Group 1 metals (like Hg and Pb) form chlorides when treated with dilute HCl.
- Example: HgCl and PbCl2 are precipitated.
- **Conclusion**: This statement is **correct**.

2. **Statement 2: Group 4 basic radicals are precipitated as sulfides.**
- Group 4 elements (like Zn and Ni) form sulfides when treated with H2S gas.
- Example: ZnS and NiS are precipitated.
- **Conclusion**: This statement is **correct**.

3. **Statement 3: Group 5 basic radicals are precipitated as carbonates.**
- Group 5 elements (like Ba and Sr) form carbonates when treated with ammonium carbonate (NH4)2CO3.
- Example: BaCO3 and SrCO3 are precipitated.
- **Conclusion**: This statement is **correct**.

4. **Final Conclusion**: Since all three statements are correct, the answer to the question is that **all statements are true**.