Discussion
The sulphur system has four phases: rhombic, monoclinic, liquid and vapour. The maximum number that can coexist at equilibrium is
Answer: D
Correct answer: three
\[ P \le C + 2 = 1 + 2 = 3. \] The system has four possible phases but only three can coexist at once, so the sulphur diagram has several distinct triple points - rhombic with monoclinic and vapour, monoclinic with liquid and vapour, and rhombic with monoclinic and liquid - but no point at which all four meet.
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