Question

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

Answer 1

The chemical reaction is an example of thermal decomposition reaction.

`2"FeSO"_4("s") overset("heat")(->) "Fe"_2"O"_3("s") + "SO"_2("g") + "SO"_3("g")`

The gases evolved are a mixture of sulphur dioxide and sulphur trioxide. Both have the smell of burning sulphur.