Question

Bhawna took a pale green substance $A$ in a test tube and heated it over the flame of a burner. A brown coloured residue $B$ was formed along with the evolution of two gases with buring smell of sulphur. Identify $A$ and $B$ . Write the chemical reaction involved.

Answer 1

When ferrous sulphate which is pale green substance on decomposition produce brown colour residue of ferric acid and oxides of sulphur.

$\underset{A}{\underset{}{2FeS{O}_4\left(s\right)}}⟶\underset{B}{\underset{}{F{e}_2{O}_3\left(s\right)}}+S{O}_2\left(g\right)+S{O}_3\left(g\right)$