Question

The crystalline form of sulphur that is stable at room temperature is:

• A. milk sulphur
• B. rhombic sulphur
• C. monoclinic sulphur
• D. plastic sulphur

Answer 1

The correct option is B rhombic sulphur

Sulphur is a non-metal which exists in different crystal structures known as allotropes. The stable form at room temperature is called rhombic sulphur, and when this is heated slowly above about $95ºC$, it transforms into monoclinic sulphur.