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Question

(a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?
ā€‹(b) Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change? Write chemical equation of the reaction.

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Solution

(a) Ferrous sulphate is green in colour. On heating, the green crystals are converted into a dirty-yellow anhydrous solid as it loses water of crystallization.

(b) When ferrous sulphate is strongly heated anhydrous material loses sulphur dioxide and sulphur trioxide leaving a reddish-brown iron oxide.
2FeSO4Fe2O3+SO2+SO3

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