Question

Identify the test tube in which the colour changes to pale green. Name the type of chemical reaction and Write the word equation for the reaction?

Answer 1

Answer:

a certain pale

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Answer 2

Explanation:

I have wrote 2 types of answers which one you will understand you can choose that answer and write..

1)

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.

2)

The green colour substance is Ferrous sulphate.

When ferrous sulphate is heated strongly, it decomposes to form ferric oxide, sulphur dioxide and sulphur trioxide :  

   2FeSO4(s)        −→heat Fe2O3(s)         +SO2(g)            + SO3(g)Ferrous sulphate       Ferric Oxide       Sulphur              Sulphur(Green Colour)         (Brown Colour)     dioxide              trioxide

This is a decomposition reaction since one substance is splitting up into three substances.  In this reaction , the green colour of ferrous sulphate changes to brown due to the formation of ferric oxide . A smell of burning sulphur is obtained due to the the formation of sulphur dioxide.