Question

Bhawna took a pale green substance 'A'in a test tube and heated it on the flame of a burner . a brown colour residue 'B' was formed along with evolution of two gases with burning smell of smell of sulphur . identify a'A' and'B' . write the chemical equation involved.

Answer 1

 Thermal decomposition has occured.
A is FeSO4
B is Fe2O3
2 FeSO4 (s) → Fe2O3 (s)+ SO2 (g) + SO3 (g)