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The p-Block Elements
Question
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Sulphur melts to clear mobile liquid at 119°C, but on further heating above 160°C, it becomes viscous. Why?

Answer

Rhombic sulphur has a eight membered puckered ring structure On heating ring tends to break and linear chain sulphur tends to formed.Molten sulphur at 119°C exists as S8 ring which roll over one another Hence it is mobile. Above 160°C rings are cleaved and the resulting open chains tangle together with the result sulphur becomes viscous.

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