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?

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Q.

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?

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a

The boiling point goes on changing

b

The mixture has highest vapour pressure than for any other composition

c

Composition of an azeotrope alters on changing the external pressure

d

The composition of distillate differs from the mixture

answer is D.

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Detailed Solution

On changing external pressure, composition of azeotrope alters. If pressure is high, the mixture boils at a higher temperature; if the pressure is low, the mixture boils at a lower temperature. Therefore there can be a change in composition of the azeotropic mixture.

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