Which of the following compounds gives a mixture of `SO_(2)` and `SO_(3)`
on heating ?

Options

A. `ZnSO_4`
B. `Fe_2(SO_4)_3`
C. `FeSO_4`
D. `CuSO_4`

Explanation

To determine which compound gives a mixture of SO2 and SO3 upon heating, we will analyze the reactions of the given compounds one by one.

### Step-by-Step Solution:

1. **Analyze Zinc Sulfate (ZnSO4)**:
- When zinc sulfate is heated, it decomposes to form zinc oxide (ZnO) and sulfur dioxide (SO2) along with oxygen (O2).
- The reaction can be represented as:
\[ 2 \text{ZnSO}_4 \rightarrow 2 \text{ZnO} + 2 \text{SO}_2 + \text{O}_2 \]
- **Conclusion**: This reaction produces only SO2. Therefore, it does not give a mixture of SO2 and SO3.

2. **Analyze Iron(III) Sulfate (Fe2(SO4)3)**:
- When iron(III) sulfate is heated, it decomposes to form iron(III) oxide (Fe2O3) and sulfur trioxide (SO3).
- The reaction can be represented as:
\[ 2 \text{Fe}_2(\text{SO}_4)_3 \rightarrow \text{Fe}_2\text{O}_3 + 3 \text{SO}_3 \]
- **Conclusion**: This reaction produces only SO3. Therefore, it does not give a mixture of SO2 and SO3.

3. **Analyze Iron(II) Sulfate (FeSO4)**:
- When iron(II) sulfate is heated, it decomposes to form iron(III) oxide (Fe2O3), sulfur dioxide (SO2), and sulfur trioxide (SO3).
- The reaction can be represented as:
\[ 4 \text{FeSO}_4 \rightarrow 2 \text{Fe}_2\text{O}_3 + 4 \text{SO}_2 + \text{SO}_3 \]
- **Conclusion**: This reaction produces both SO2 and SO3, indicating that it gives a mixture of both gases.

4. **Analyze Copper(II) Sulfate (CuSO4)**:
- When copper(II) sulfate is heated, it decomposes to form copper(II) oxide (CuO) and sulfur dioxide (SO2) along with oxygen (O2).
- The reaction can be represented as:
\[ 2 \text{CuSO}_4 \rightarrow 2 \text{CuO} + 2 \text{SO}_2 + \text{O}_2 \]
- **Conclusion**: This reaction produces only SO2. Therefore, it does not give a mixture of SO2 and SO3.

### Final Answer:
The compound that gives a mixture of SO2 and SO3 upon heating is **Iron(II) Sulfate (FeSO4)**.

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