2g of ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation for the reaction.

(i) As ferrous sulphate crystals are heated, the following two observations occur:

(a) Green colour of FeSO₄ disappears which means a change in state and colour occurs.

(b) The reddish brown solid is formed and a gas is generated during this process.
(ii) It is a decomposition reaction since the compound (ferrous sulphate) decomposes into two or more substances.

(iii) The following is the chemical reaction equation.

$2FeS{O}_4\left(s\right)+Heat\left(\Delta \right)⟶{Fe}_2{O}_3\left(s\right)+S{O}_2\left(g\right)+S{O}_3\left(g\right)$