When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out(i) Name the iron salt X.(ii) Name the type of reaction.(iii) Write the balanced chemical equation for the reaction involved.(iv) Is this reaction exothermic or endothermic?(v) Give one more example of this type of reaction.

(i) The name of the salt X: Iron Sulphate (green vitriol).

(ii) Type of reaction:

The reaction that takes place when Iron sulphate is heated is known as Decomposition Reaction.

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.

AB--> A + B

(iii) The chemical equation: 

The iron sulphate decomposes to give Iron(III)oxide, sulphur dioxide and sulphur trioxide.

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

The burning sulphur smell is due to the sulphur oxides while the black compound is a ferric oxide.

(iv) It is an Endothermic Reaction as heat is absorbed in this reaction.

(v) One more example of Decomposition Reaction is:

2H₂O (l) → 2H₂ (g) + O₂ (g)

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Updated on: 10-Oct-2022

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