1. Iron(III) Oxide (Fe2O3): This is the main product of the decomposition. It is a reddish-brown powder and is commonly known as rust.
2. Sulphur Dioxide (SO2): This gas is released as a byproduct of the decomposition. It has a pungent odor and is harmful if inhaled.
3. Water Vapor (H2O): Water vapor is also released as a byproduct of the decomposition.
The overall chemical reaction for the decomposition of ferrous sulphate can be represented as follows:
```
2FeSO4(s) -> Fe2O3(s) + 2SO2(g) + H2O(g)
```
In addition to these main products, other minor products may also be formed, such as iron(II) oxide (FeO) and iron(III) sulphate (Fe2(SO4)3). The exact composition of the products can vary depending on the conditions of the heating process.
