`HNO_(3)` or `H_(2)SO_(4)` are not used to prepare solution for analysis of basic radicals.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks why `HNO3` (Nitric acid) and `H2SO4` (Sulfuric acid) are not used to prepare solutions for the analysis of basic radicals.

2. **Identifying the Properties of Acids**: Both `HNO3` and `H2SO4` are known to be strong acids and also act as oxidizing agents. This property is crucial in understanding their effects during the analysis of basic radicals.

3. **Analyzing the Role of Oxidizing Agents**:
- **HNO3**: As an oxidizing agent, it can oxidize certain ions present in the solution, which may lead to the formation of new compounds that interfere with the identification of basic radicals.
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