`BaSO_(3)darr+H_(2)SO_(4) to BaSO_(4) darr+SO_(2)uarr+H_(2)O`

Options

A. For precipitate formation formation reaction
B. For precipitate dissolution reaction
C. For precipitate exchange reaction
D. For no reaction

Answer

To analyze the given chemical reaction and determine the type of reaction it represents, we can break it down step by step.

### Step-by-Step Solution:

1. **Identify the Reactants and Products:**
The given reaction is:
\[ \text{BaSO}_3 \, (s) + \text{H}_2\text{SO}_4 \, (aq) \rightarrow \text{BaSO}_4 \, (s) + \text{SO}_2 \, (g) + \text{H}_2\text{O} \, (l) \]
- Reactants: Barium sulfite (BaSO₃) and sulfuric acid (H₂SO₄).
- Products: Barium sulfate (BaSO₄), sulfur dioxide (SO₂), and water (H₂O).

2. **Analyze the State of the Compounds:**
- BaSO₃ is a solid (s).
- H₂SO₄ is an aqueous solution (aq).
- BaSO₄ is a solid (s), which is a precipitate.
- SO₂ is a gas (g).
- H₂O is a liquid (l).

3. **Determine the Type of Reaction:**
- **Precipitate Formation Reaction:** This occurs when a solid (precipitate) forms from the reaction of two aqueous solutions. In this case, BaSO₄ is formed as a solid from the reaction.
- **Precipitate Dissolution Reaction:** This would involve a solid dissolving into ions in solution, which is not the case here.
- **Precipitate Exchange Reaction:** This occurs when one precipitate is exchanged for another. Here, we start with BaSO₃ (a precipitate) and end with BaSO₄ (another precipitate), indicating a change in the precipitate formed.
- **No Reaction:** This would imply that the reactants do not change into products, which is not applicable here.

4. **Conclusion:**
Since we started with BaSO₃ as a precipitate and ended with BaSO₄ as a different precipitate, this reaction is classified as a **precipitate exchange reaction**.

### Final Answer:
The correct classification of the reaction is a **precipitate exchange reaction**.

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