Question

5. 2 g Ferrous sulphate crystal is heated in a test tube.
(i) Write the two observations during this reaction.
(ii) Write the chemical reaction involved and identify the type of reaction.

Answer 1

Explanation:

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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Answer 2

Answer:

(i)  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)