Which of the following metal sulphate will give ${\mathrm{SO}}_2$ and ${\mathrm{SO}}_3$ both gaseous product on beating?

${\mathrm{FeSO}}_4$ (Feeric sulphate) on heating gives sulphur dioxide, ${\mathrm{SO}}_2$ and sulphur trioxide, ${\mathrm{SO}}_3$

On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate ${\mathrm{FeSO}}_4$ is formed.

So, their colour changes from light green to white. On further heating; anhydrous ferrous sulphate decomposes to form ferric oxide $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$ , sulphur dioxide,${\mathrm{SO}}_2$  and sulphur trioxide, ${\mathrm{SO}}_3$ The reaction is as follows: