Question

2g of ferrous sulphate crystals are heated in a boiling tube.
(i) State the colour of ferrous sulphate crystals both before heating and after heating.
(ii) Name the gases produced during heating.
(iii) Write the chemical equation for the reaction.

Answer 1

(i) The colour of the ferrous sulphate crystals is green before heating and changes to brown after heating. The colour of the crystals changes due to the formation of ferric oxide.
(ii) During heating sulphur dioxide `(SO_(2))` and sulphur trioxide `(SO_(3))` are produced.
(iii) `{:(2FeSO_(4) (s) overset("Heat")rarr Fe_(2)O_(3)(s) + SO_(2)(g)+SO_(3) (g) ),(" Ferric oxide"):}`