Strongly acidified solution of barium give a white precipitate with ……which did not dissolve even after large addition of water

Options

A. Sodium phosphate
B. Sodium carbonate
C. Sodium salphate
D. Sodium chloride

Explanation

To solve the question "Strongly acidified solution of barium gives a white precipitate with …… which did not dissolve even after large addition of water," we need to analyze the options provided and understand the chemistry involved.

### Step-by-Step Solution:

1. **Identify the Reaction**: We are looking for a substance that reacts with a strongly acidified solution of barium to form a white precipitate. Barium ions (Ba²⁺) are known to form precipitates with certain anions.

2. **Consider the Options**: The options given are:
- A) Sodium phosphate (Na₃PO₄)
- B) Sodium carbonate (Na₂CO₃)
- C) Sodium sulphate (Na₂SO₄)
- D) Sodium chloride (NaCl)

3. **Analyze Each Option**:
- **Sodium phosphate (Na₃PO₄)**: When reacted with barium ions, it forms barium phosphate (Ba₃(PO₄)₂), which is a white precipitate but is soluble in strong acids.
- **Sodium carbonate (Na₂CO₃)**: This would produce barium carbonate (BaCO₃), which is a white precipitate but is also soluble in acidic conditions.
- **Sodium sulphate (Na₂SO₄)**: This reacts with barium ions to form barium sulphate (BaSO₄), which is a white precipitate that is insoluble in water and even in acidic solutions.
- **Sodium chloride (NaCl)**: This does not form any precipitate with barium ions.

4. **Conclusion**: The only option that forms a white precipitate that is insoluble in water and even in an acidic medium is sodium sulphate (Na₂SO₄), which produces barium sulphate (BaSO₄).

5. **Final Answer**: Therefore, the correct answer is **C) Sodium sulphate**.