Which of the following is not produced upon the thermal decomposition of ferrous sulphate?
 

On heating, ferrous sulphate decomposes to produce ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃). Ferric oxide is a solid, while SO₂ and SO₃ are gases. Ferrous oxide is not produced in this reaction.

$2{{\mathrm{FeSO}}_4}_{\left(\mathrm{s}\right)} \stackrel{\mathrm{Heat}}{\to } {\mathrm{Fe}}_2{\mathrm{O}}_{3\left(\mathrm{s}\right)} + {\mathrm{SO}}_{2\left(\mathrm{g}\right)} +2{\mathrm{SO}}_{3\left(\mathrm{g}\right)}$