The inerferring radicals interfere in the test of usal inorganic analysis after II group analysis due to:

Options

A. their solubility in acid medium
B. their solubilty in alkaline medium
C. their insoluble nature in alkaline madium
D. none of these

Explanation

To solve the question regarding why interfering radicals affect the usual inorganic analysis after the second group analysis, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Interfering Radicals**:
- Interfering radicals are specific ions that can complicate the analysis of other ions in a solution. In this context, the interfering radicals mentioned are \( \text{PO}_4^{3-} \), \( \text{C}_2\text{O}_4^{2-} \), \( \text{BO}_3^{2-} \), and \( \text{F}^- \).

2. **Identifying the Medium**:
- The analysis takes place in an alkaline medium. In inorganic analysis, the medium can significantly affect the solubility of various compounds.

3. **Solubility of Interfering Radicals**:
- In an alkaline medium, certain compounds can become soluble. The interfering radicals mentioned are typically insoluble in neutral or acidic conditions but can dissolve in alkaline conditions.

4. **Impact on Analysis**:
- The solubility of these interfering radicals in an alkaline medium means that they can remain in solution and potentially react with the ions being tested for in the second group analysis. This can lead to false positives or negatives during the analysis.

5. **Conclusion**:
- Therefore, the reason that these interfering radicals affect the usual inorganic analysis after the second group analysis is due to their insoluble nature in neutral or acidic conditions, which changes to soluble in an alkaline medium. This solubility allows them to interfere with the detection of other ions.

### Final Answer:
The interfering radicals interfere in the test of usual inorganic analysis after II group analysis due to their insoluble nature in neutral or acidic conditions, which changes to soluble in an alkaline medium.

---