Name the anions whch giive brown fumes on reacting with dilute/conc. `H_(2)SO_(4)`

Explanation

To solve the question regarding the anions that give brown fumes when reacting with dilute or concentrated sulfuric acid (H₂SO₄), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction with Dilute H₂SO₄**:
- When certain anions react with dilute sulfuric acid, they can produce gases that may exhibit a brown color.
- The anion that is known to produce brown fumes when reacted with dilute H₂SO₄ is the **nitrate ion (NO₃⁻)**.

...