When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.
Name the iron salt.

Explanation

To solve the question, we need to identify the green iron salt that changes color to brown and emits the odor of burning sulfur when heated.

### Step-by-Step Solution:

1. **Identify the Color of the Iron Salt**:
- The question states that the iron salt is green in color. This indicates the presence of ferrous ions (Fe²⁺), which typically impart a green color to iron salts.

2. **Determine the Anion Present**:
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