Q. Which one of the following non-metals shows allotropy in the liquid state?
Answer: Sulphur
Notes: Sulphur is a non-metal that shows allotropy in the liquid state. If sulphur is heated slowly the changes between the different forms can be observed. These changes are in the form of colour and viscosity (thickness) of the liquid. If the dark brown liquid sulphur is poured into a beaker of cold water, plastic sulphur is formed. This is an elastic, rubber-like form of sulphur. The tow commonly know allotropic forms of sulphur are monoclinic and rhombhic sulphur.

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Question Number: 38 in Chemistry-18-Important Non-Metals in above course in App.