`CaSO_(3)darr+H_(2)SO_(4)toCaSO_(4)+SO_(2)uarr+H_(2)O`

Options

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

Answer

To solve the given reaction and identify its type, we can follow these steps:

### Step 1: Write the Reaction
The reaction provided is:
\[ \text{CaSO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + \text{SO}_2 + \text{H}_2\text{O} \]

### Step 2: Identify the Reactants and Products
- **Reactants**: Calcium sulfite (CaSO₃) and sulfuric acid (H₂SO₄).
- **Products**: Calcium sulfate (CaSO₄), sulfur dioxide (SO₂), and water (H₂O).

### Step 3: Analyze the State of Reactants and Products
- Calcium sulfite (CaSO₃) is typically a solid and can be considered a precipitate.
- Sulfuric acid (H₂SO₄) is a liquid.
- Calcium sulfate (CaSO₄) is also a solid precipitate.
- Sulfur dioxide (SO₂) is a gas.
- Water (H₂O) is a liquid.

### Step 4: Determine the Type of Reaction
In this reaction:
- The solid precipitate (CaSO₃) reacts with sulfuric acid (H₂SO₄) and forms another solid precipitate (CaSO₄), along with a gas (SO₂) and water (H₂O).
- Since a precipitate (CaSO₃) is dissolved to form another precipitate (CaSO₄), this indicates that the reaction involves the dissolution of a precipitate.

### Step 5: Conclusion
The correct classification of this reaction is a **precipitate dissolution reaction** because the initial precipitate (CaSO₃) is dissolved to form a new precipitate (CaSO₄) along with the release of gas (SO₂) and water (H₂O).

### Final Answer
The reaction is classified as a **precipitate dissolution reaction**.

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