Question 23

An element X, which is a yellow solid at room temperature, shows catenation and allotropy. The element X forms mainly two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants. Most likely the element X is

Sulphur is a yellow solid that shows catenation (e.g. $$\text{S}_8$$ rings) and allotropy (rhombic and monoclinic). Heating ferrous sulphate gives $$2\text{FeSO}_4 \rightarrow \text{Fe}_2\text{O}_3 + \text{SO}_2 + \text{SO}_3$$, and $$\text{SO}_2$$ and $$\text{SO}_3$$ are major air pollutants. Hence X is sulphur.

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