Question

Azeotropic mixtures are?
A. Mixture of two solids
B. Those which boil at different temperatures
C. Those which can be fractionally distilled
D. Constant boiling mixtures

Answer 1

Hint: In order to deal with this question first we will understand the term azeotropic mixture further according to its definition and property we will find the required answer. Azeotropes are the mixture of two or more different liquids that have the same concentration in the vapour and liquid phases.

Complete step by step answer:
Basically, the azeotropic mixture has constant or equivalent boiling points and the vapor of the mixtures will also have the same composition as the liquid.
From the above definition and discussion it is clear that the azeotropes are not the mixture of the solids but it is the mixture of the liquids. So option (A) is incorrect.
Azeotropic mixtures are the mixture boils at the constant temperature, so the option (B) is also an incorrect answer.
Usually, distillation is used to separate materials as the optimal solution, one component being usually more reactive than the other. In an azeotropic mixture, though, because the quantities of vapor and fluid will be the same, and this method will avoid their isolation. So the option (C) is also incorrect.
Since the azeotrope mixtures of the liquids are that which has a constant boiling point in which the composition of the vapour is the same as that of the liquid.
Hence option (D) is the correct answer.

Note:
On the basis of the particle size mixtures can be divided into three types : Suspension mixture, Colloidal mixture and Solution, ( also based on whether they can be mixed and isolated from each other). Suspension mixtures contain bigger particles of the solute, colloidal mixtures have even smaller particles and particles melt entirely into the liquid in a solution. The components of a mixture have their own physical properties and hence they can be separated by methods like filtering, boiling or some other advanced physical processes.