Question

(a) Decomposition of ferrous sulphate
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Answer 1

Answer:

on heating ferrous sulphate (FeSO4) is formed. ... On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). So, the gas emitted smells like burning sulphur.

Explanation:

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Answer 2

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Decomposition of ferrous sulphate is an endothermic reaction as it involves absorption of heat to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). The equation for this reaction can be written as:

2FeSO4(s) -> Fe2O3(s) + SO2(g) + SO3(g)