Question

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

Decomposition of ferrous sulphate.

Answer 1

• Endothermic reactions are reactions where energy is absorbed in the form of heat. For example, the melting of ice cubes.
• Exothermic reactions are reactions in which energy is released in the form of heat. For example, rusting of iron.

Decomposition of ferrous sulfate:

$\underset{\mathrm{ferrous}\mathrm{sulphate}}{{\mathrm{FeSO}}_4\left(\mathrm{s}\right)}\stackrel{∆}{\to }\underset{\mathrm{ferric}\mathrm{oxide}}{{\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{sulphur}\mathrm{dioxide}}{{\mathrm{SO}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{sulphur}\mathrm{trioxide}}{{\mathrm{SO}}_3\left(\mathrm{g}\right)}$

The ferrous sulfate decomposes to give the ferric oxide, sulfur dioxide, and sulfur trioxide. There is the absorption of heat in this reaction thus it is an endothermic reaction.