Suman took a pale green substance A in a test tube, and heated it over the flame of a burner. A brown coloured residue B was formed along with evolution of two gases with the burning smell of sulphur. Identify A & B.
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Ferrous sulphate(FeSO₄) is green in colour.
When heated , it decomposes to form ferric oxide (Fe₂O₃) , which is reddish brown in colour , and two gases , namely , Sulphur dioxide (SO₂) and Sulphur trioxide (SO₃) are evolved.
heat
2FeSO₄ ------------> Fe₂O₃ + SO₂ + SO₃ .
This reaction is and example of decompostion reaction .
As this reaction needs heat to take place , this reaction is categorized as thermal decomposition reaction.
The burning smell of sulphur is obtained as sulphur dioxide gase and trioxide gas evolved.
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