Discussion
Assertion (A): A Txy diagram must be labelled with the pressure at which it was constructed.
Reason (R): For a binary two-phase system the compositions are fixed only once both temperature and pressure are given.
Answer: D
Both are true and the reason gives the necessity: the same pair of components produces a different diagram at every pressure, so an unlabelled diagram cannot be used for any quantitative work. The pressure belongs in the caption of every such plot.
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