A liquid mixture having composition corresponding to point z in the figure shown is subjected to distillation at constant pressure. Which of the following statement is correct about the process (a) The composition of distillate differs from the mixture (b) The boiling point goes on changing (c) The mixture has highest vapour pressure than for any other composition. Temp. (d) Composition of an azeotrope alters on changing the external pressure. A=0 XA=0 mole fraction XA=1 YA=1