Concentrated `HNO_(3)` and concentrated `H_(2)SO_(4)` can.t be used for the preparation of `H_(2)S`. Give a reason.

Explanation

To answer the question, "Why can't concentrated HNO₃ and concentrated H₂SO₄ be used for the preparation of H₂S?", we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Compounds**:
- Concentrated HNO₃ (Nitric Acid) and H₂SO₄ (Sulfuric Acid) are both strong acids and also act as oxidizing agents.

2. **Role of Oxidizing Agents**:
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