Question

2 gram of ferrous sulphate crystal are heated in a boiling tube.
Answer the following questions-
a) State the colour of ferrous sulphate crystal both before heating and after heating.
b) Name the gases produced during heating.
c) Write the chemical equation for the reaction.

Answer 1

Answer:

7H2O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white. On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3).

Explanation:

Answer 2

Answer:

(i) pale green

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)