Question

(a) What is the colour of ferrous sulphate crystals? How does this colour change after heating? (b) Name the products formed on strongly heating ferrous sulphate crystals.

Answer 1

Ferrous sulphate crystals are green in colour and after heating,they become white.
On strongly heating ferrous sulphate crystals;ferric oxide,sulphur dioxide and sulphur trioxide are formed.
2 FeSO$_{4} =\ \textgreater \ Fe _{2}O _{3} + SO _{2} + SO _{3}$

Answer 2

On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white. On furtherheating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3).

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