Question

2 g of ferrous sulphate crystals are heated in a dry boiling tube.
(a) List any two observations.
(b) Name the type of chemical reaction taking place.
(C) Write balanced chemical equation for the reaction and name the
products formed.​

Answer 1

Answer:

1.it changes the colour to brown or reddish brown

2.gases formed so2and so3

3.2FeSo4 which gives after heating Fe2o3+ So2 +So3

Answer 2

When Ferrous Sulphate crystals (green vitrol) are heated, the seven water molecules of crystallization attached to one formula unit mass of ferrous sulphate get removed. The chemical reaction representing the above chemical change is as below:

FeSO₄ . 7H₂O ------heat-------> FeSO₄ + 7H₂O

On further heating, FeSO₄ decomposes to form ferric oxide, and evolve SO₂ and SO₃ gases. The chemical reaction representing the above chemical change is as below:

FeSO₄ -----heat------> Fe₂O₃ + SO₂ + SO₃

Observations:

1. Tiny water droplets are seen on the inner surface of the test-tube.
2. The color changes from green to white and then to brown.
3. Suffocating gases SO₂ and SO₃ are released.

Type of Chemical Reaction: Decomposition Reaction

- In a decomposition reaction, a single reactant breaks down into various products under favorable conditions like heat, electricity or light.