Question

Name the products formed when ferrous sulphate is heated in a dry test tube

Answer 1

Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.

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.

In this reaction, the single reactant FeSO4 decomposes to form three different products. So, the reaction is a decomposition reaction.

Answer 2

Sulphur dioxide, sulphur trioxide and ferric oxide are the products formed when ferrous sulphate is heated in a dry test tube.

Explanation:

Ferrous sulphate has chemical formula of $FeSO_4$ . It undergoes decomposition, that is it breaks into two or more than two products on heating in a dry test tube. Two gases are evolved namely sulphur dioxide  and sulphur trioxide and a solid ferric oxide which remains as such and is called as residue.

The chemical reaction of decomposition is given as:

$2FeSO_4(s)\rightarrow Fe_2O_3(s)+SO_2(g)+SO_3(g)$

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