Can we use `Ba(NO_(3))_(2)` instead of `BaCl_(2)` for testing sulphate radical?

Explanation

To determine whether we can use barium nitrate (Ba(NO₃)₂) instead of barium chloride (BaCl₂) for testing the sulfate radical (SO₄²⁻), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Requirement for Testing Sulfate Radical**:
- To test for the sulfate radical (SO₄²⁻), we need barium ions (Ba²⁺) to react with the sulfate ions.

2. **Understand the Role of Barium Salts**:
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