When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.
Name the type of reaction that takes place during heating of iron salt.

Explanation

To determine the type of reaction that occurs when a green iron salt (ferrous sulfate, FeSO4) is heated, we can follow these steps:

### Step 1: Identify the Reactant
The green iron salt mentioned in the question is ferrous sulfate (FeSO4).

### Step 2: Understand the Changes During Heating
When ferrous sulfate is heated strongly, it undergoes a change in color from green to brown. This color change indicates a transformation in the chemical composition. Additionally, there is an odor of burning sulfur, which suggests the release of sulfur compounds.

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