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Question

Rhombic and monoclinic sulphur are:
  1. isomers of sulphur
  2. isotopes of sulphur
  3. allotropes of sulphur
  4. isobars of sulphur

A
allotropes of sulphur
B
isomers of sulphur
C
isotopes of sulphur
D
isobars of sulphur
Solution
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Answer:
Rhombic and monoclinic sulphur are the allotropes of sulphur. Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements. The chemical properties of allotropes are, however different.

Rhombic sulphur is the most stable allotropic form of sulphur that exists as rhombic octahedral crystals, whereas, the monoclinic sulphur exists as long, needle-shaped prisms but, it is stable only at temperatures between 96C and 119C.

Hence. option (C) is correct.

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