Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Explanation

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is ferrous sulphate, which has the chemical formula \( \text{FeSO}_4 \).

2. **Understand the Decomposition**: Ferrous sulphate decomposes when heated. This means that it breaks down into simpler substances when subjected to heat.

3. **Write the Decomposition Reaction**: When ferrous sulphate decomposes upon heating, it produces iron(III) oxide (\( \text{Fe}_2\text{O}_3 \)), sulfur dioxide (\( \text{SO}_2 \)), and sulfur trioxide (\( \text{SO}_3 \)). The balanced chemical equation for this reaction is:
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