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Rhombic and monoclinic sulphur are related as

  • A.polymorphic forms of the same substance
  • B.two different chemical components
  • C.a liquid and its supercooled state
  • D.a compound and its decomposition product

Answer: A

Correct answer: polymorphic forms of the same substance

Rhombic and monoclinic sulphur are the same chemical substance in different crystal structures, so they count as two phases but only one component. This is what allows a one-component system to have four possible phases while still obeying the limit of three at equilibrium.

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