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Q.

What is the colour of ferrous sulphate crystals? What type of chemical reaction occurs in this type of change.  

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a

Green, Decomposition Reaction

b

Grey, Decomposition Reaction

c

Green, Displacement Reaction

d

Blue, Decomposition Reaction 

answer is A.

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Detailed Solution

●        Ferrous sulphate crystals have water molecules (FeSO4.7H2O). By heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.
●        This Reaction is Decomposition Reaction because in this the water molecules get decomposed or break from the crystal molecule.
  
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