Question

Strong heating of ferrous sulphate leads to the formation of a brown solid
and two gases. This reaction can be categorised as
(A) displacement and redox.
(B) decomposition and redox.
(C) displacement and endothermic.
(D) decomposition and exothermic.​

Answer 1

Answer:

On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3),sulphur dioxide (SO2) and sulphur trioxide(SO3). So, the gas emitted smells like burning sulphur. This may be categorized as a decomposition and redox reaction

Answer 2

This reaction can be categorised as  (B) decomposition and redox.

- Ferrous sulphate when heated gets decomposed into ferric oxide, sulphur dioxide and sulphur trioxide as follows:

2FeSO4  →  Fe2O3 + SO2 + SO3

- Here, the oxidation number of iron changes from +2 in FeSO4 to +3 in Fe2O3 causing oxidation.

- The oxidation state of S changes from +6 in FeSO

4 to +4 in SO2 causing reduction.

- Hence, this decomposition reaction is also a redox reaction.