Why is it necessary to test for the acid radicals first (with dilute) `H_(2)SO_(4)` and then with conc. `H_(2)SO_(4)`?

Explanation

To answer the question of why it is necessary to test for acid radicals first with dilute H₂SO₄ and then with concentrated H₂SO₄, we can break down the reasoning into clear steps:

### Step-by-Step Solution:

1. **Understanding Acid Radicals**:
- Acid radicals are negatively charged ions that can be present in a salt. Examples include sulfite (SO₃²⁻), sulfate (SO₄²⁻), nitrate (NO₃⁻), chloride (Cl⁻), bromide (Br⁻), and iodide (I⁻).

2. **Reactivity with Dilute H₂SO₄**:
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