Question

2g of ferrous sulphate crystals are heated in a boiling tube-
i) Name the gases produced during heating
ii)Give the chemical equation

Answer 1

2 g of ferrous sulphate crystals are heated in a boiling tube then  we observe that :

1 Ferrous sulphate crystals contains 2 water moelcules.

On heating it looses water molecules and becomes anhydrous ferrous sulphate .

2. Colour changes from  light green to white . Ferrous sulphate crystals  which are in green colour decomposes  to give Ferric oxide , sulphur dioxide and sulphur trioxide gas.

3. On further heating  FeSO4 anhydrous changes to dark brown solid ..

4. The gas emitted has the characteristics smell of sulphur.

Chemical reaction :.

2FeSO4 (S) -------------->Fe2O3 (S) +SO2(g) +SO3 (g)

Anhydrous                  Ferric oxide

Ferrous sulphate

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