Question

What is the effect of heat on sulphur?

Answer 1

1. Sulphur melts at 385.8 K, forming a pale yellow liquid.
2. On further heating, liquid sulphur becomes thicker and dark brown due to chain formation from S₈ rings.
3. At about 453 K, it becomes very viscous and stops flowing.
4. Above 453 K, viscosity decreases as chains break and it becomes more fluid.
5. At 718 K, sulphur boils, giving reddish-brown vapours of S₈.
6. At higher temperatures, vapours dissociate into S₄, S₂, and atomic sulphur.