Sulphur dioxide can be obtained by which of the following reaction

Options

A. `CaSO_(4)+C overset∆ rarr`
B. `H_(2)SO_(4)+PCl_(5) overset∆ rarr`
C. `S+H_(2)SO_(4)overset∆ rarr`
D. `Fe_(2)(SO_(4))_(3) overset∆ rarr`

Answer

To determine which reactions produce sulfur dioxide (SO₂), we will analyze each given reaction step by step.

### Step 1: Analyze the first reaction
**Reaction:** CaSO₄ + C (heating)
**Products:** CaO + CaO₂ + SO₂ + CO
**Analysis:** In this reaction, sulfur dioxide (SO₂) is produced when calcium sulfate (CaSO₄) reacts with carbon upon heating.
**Conclusion:** This reaction produces sulfur dioxide.

### Step 2: Analyze the second reaction
**Reaction:** H₂SO₄ + CaCl₂ (heating)
**Products:** Ca(OCl)₂ + HSO₃Cl + HCl
**Analysis:** In this reaction, sulfur dioxide is not produced. The products do not include SO₂.
**Conclusion:** This reaction does not produce sulfur dioxide.

### Step 3: Analyze the third reaction
**Reaction:** S + H₂SO₄ (heating)
**Products:** SO₂ + H₂O
**Analysis:** In this reaction, sulfur (S) reacts with sulfuric acid (H₂SO₄) to produce sulfur dioxide (SO₂) and water (H₂O).
**Conclusion:** This reaction produces sulfur dioxide.

### Step 4: Analyze the fourth reaction
**Reaction:** 2FeSO₄ (heating)
**Products:** Fe₂O₃ + SO₃
**Analysis:** When iron(II) sulfate (FeSO₄) is heated, it decomposes to form iron(III) oxide (Fe₂O₃) and sulfur trioxide (SO₃).
**Conclusion:** This reaction does not produce sulfur dioxide.

### Final Conclusion
From the analysis:
- **Reactions that produce sulfur dioxide:**
- Reaction 1 (CaSO₄ + C)
- Reaction 3 (S + H₂SO₄)

Thus, sulfur dioxide can be obtained from the reactions in options A and C.