Question

Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulfate

Answer 1

Exothermic reaction

• Exothermic reactions are reactions in which heat energy is released in the form of light or heat.

Endothermic reaction

• Endothermic reactions are reactions in which heat energy is absorbed.

Decomposition of ferrous sulfate

• The decomposition of ferrous sulfate is as follows:-

$$\begin{gathered} 2{\mathrm{FeSO}}_4\left(\mathrm{s}\right)\stackrel{∆}{\to }{\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{SO}}_3\left(\mathrm{g}\right) \\ \mathrm{Ferrous}\mathrm{sulphate}\mathrm{Ferric}\mathrm{oxide}\mathrm{Sulphur}\mathrm{dioxide}\mathrm{Sulphur}\mathrm{trioxide} \end{gathered}$$

• In this reaction, a single reactant breaks down to give the simple product.
• It is a decomposition reaction.
• To decompose ferrous sulfate, heat is required. Hence, it is an endothermic reaction.