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Q.

Sunita takes about 2 g ferrous sulphate crystals in dry boiling tube and heat the boiling tube over the 
flame of a burner or spirit lamp as shown in the figure 

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The colour of crystals after heating is:

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a

Green 

b

Orange  

c

Brown 

d

Black

answer is B.

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Detailed Solution

FeSO4.7 H2Opale green→ΔFeSO4+7 H2Odirty white 2 FeSO4→ΔFe2O3Brown+SO2↑+ SO3↑
This is thermal decomposition Reaction.   

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