Answer: Light green
- The ferrous sulphate crystals are light green. Ferrous sulphate is also obtained as a by-product in the manufacture of titanium pigment and copper sulphate.
- The gas given out smells the characteristic odour of burning sulphur.
- The heating colour changes from light green to white colour. On further heating the white substance turns into a dark brown solid.
- When ferrous sulphate is heated, it gives ferric oxide, sulphur dioxide and sulphur trioxide.