The formation of Fe₂O_3(s), SO_2(g) and SO_3(g) by heating ferrous sulphate is an example of:

The correct answer is decomposition reaction.

Key Points

• A decomposition reaction involves the breakdown of a single compound into two or more simpler substances.
• When ferrous sulfate (FeSO₄) is heated, it decomposes into ferric oxide (Fe₂O₃), sulfur dioxide (SO₂), and sulfur trioxide (SO₃).
• The chemical equation for this reaction is: 2FeSO₄ → Fe₂O₃ + SO₂ + SO₃.
• This reaction is an example of a thermal decomposition reaction, as it requires heat to occur.
• The thermal decomposition of ferrous sulfate is commonly observed in laboratory experiments to demonstrate the concept of decomposition reactions.

Additional Information

• Decomposition Reaction:
  • It is a type of chemical reaction in which a single compound breaks down into two or more simpler substances.
  • Decomposition reactions are often classified based on the energy source, such as thermal decomposition (heat), electrolytic decomposition (electricity), or photolytic decomposition (light).
• Thermal Decomposition:
  • This involves breaking down compounds using heat.
  • Examples include the decomposition of calcium carbonate (CaCO₃ → CaO + CO₂) and ferrous sulfate (2FeSO₄ → Fe₂O₃ + SO₂ + SO₃).
• Redox Aspect:
  • While this reaction involves decomposition, it also has redox characteristics, as iron is oxidized and sulfur is reduced during the process.
  • This dual nature is common in certain decomposition reactions.
• Applications of Decomposition Reactions:
  • Used in industries for extracting metals from their ores.
  • Helps in the production of gases like oxygen and carbon dioxide in laboratories.