pBlock ElementsII 1 Question 114
111. Sulphur melts to a clear mobile liquid at $119^{\circ} \mathrm{C}$, but on further heating above $160^{\circ} \mathrm{C}$, it becomes viscous, explain.
(1981, 1M)
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Solution:
- Rhombic sulphur has a eight membered puckered ring structure. On heating ring tends to break and linear chain sulphur is formed. When sulphur melts, the $\mathrm{S}_{8}$ rings slip and roll over one another very easily. It gives rise to a clear mobile liquid. When liquid sulphur is further heated to higher temperature, rings are broken giving long chain sulphur molecules. This long chain molecules of sulphur gets entangled into one another increasing viscosity of melt.
