Question

Rhombic, monoclinic and plastic sulphur are?

• A. isomers
• B. isotopes
• C. allotropes
• D. hydrides of sulphur

Answer 1

The correct option is C allotropes

Sulfur is heated to just above the melting point,which is allowed to cool and crystallise slowly as monoclinic sulfur. Remaining sulfur is heated to boiling point, and the liquid is rapidly cooled in cold water to form plastic sulfur.Another sample of sulfur is dissolved in a hot solvent, and the solution allowed to cool and evaporate, leaving crystals of rhombic sulfur.All the observed changes in properties can be related to the different structural forms of the three solid sulfur samples (allotropes).

Hence option C is correct.