Question

When a green iron salt is heated strongly its colour finally changes to ?black and odour of burning sulphur is given out. Name the iron salt. Name the type of reaction that take place. Name the compound which changes into brownish black colour. Name the compound which is responsible for its odour. Write the chemical equation of the above statement.

Answer 1

Name the iron salt:
-The salt is Ferrous iron (FeSO4)

Name the type of reaction that takes place:
-The reaction is thermal decomposition.

Compound which changes into brownish black color:
-The compound is Iron(III)oxide.

The compound responsible for its odor:
-The compound responsible for this burning sulfur is odor is sulfur dioxide and sulfur trioxide. SO2 andSO3.

The chemical equation:
            
             heat         
FeSO4--------------------------------------> Fe2O3 + SO2 + SO3
     (s)     thermal decomposition        (s)          (g)      (g)

Answer 2

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