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

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Green, Decomposition Reaction

Grey, Decomposition Reaction

Green, Displacement Reaction

Blue, Decomposition Reaction

answer is A.

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Detailed Solution

● Ferrous sulphate crystals have water molecules (

FeS O_{4} . 7 H_{2} O

). By heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (

FeS O_{4}

) 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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