Question

2 g 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 of the reaction.

Answer 1

(i) Before heating, it is pale green. 

After heating, it is brown or reddish brown.

TWo observations are :

(a) Change in state and colour.

(b) Evolution of gas.

(ii) Decomposition reaction.

(iii) 2FeSO₄(s) +Heat → Fe₂O₃(s) + SO₂(g) + SO₃(g)