Question

2 gram of ferrous sulphate crystals are heated in a dry boiling tube 1) list any two observations 2) name the type of chemical reaction taking place 3) write chemical reaction for the above reaction

Answer 1

1)The two observations on heating ferrous sulphate are
•The colour of the compound changes to light green to white which on further heating changes to dark brown.
•A gas is emitted of a characteristic smell of sulphur

2)It is an example of decomposition reaction.

3)

Answer 2

1) List any two observations:

(a) Change in state and color takes place.

(b) A gas is evolved during this process.

2) The type of chemical reaction taking place is decomposition reaction.

(3) Chemical reaction for the above reaction is as follows.

$2FeSO_{4}(s) + Heat \rightarrow Fe_{2}O_{3}(s) + SO_{2}(g) + SO_{3}(g)$

Explanation:

It is known that ferrous sulphate crystals are pale green in color before heating. And, when crystals of ferrous sulphate are heated it is brown or reddish brown in color.

Following two observations are observed when crystals of ferrous sulphate are heated:

(1) Change in state and color takes place.

(2) A gas is evolved during this process.

Since, the compound (ferrous sulphate) decomposes into two or more substances therefore, it is a decomposition reaction.

The chemical reaction equation will be as follows.

$2FeSO_{4}(s) + Heat \rightarrow Fe_{2}O_{3}(s) + SO_{2}(g) + SO_{3}(g)$

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