The solution which boil at constant temperature like a pure liquid and possess same composition in liquid as well as vapour state are called azeotropes. The components of azetropes cannot be separated by fractional distillation. Only non-ideal solutions form azeotropes. Solutions with negative deviation form maximum boiling azeotrope and the solutions with positive deviation form minimum boiling azeotrope. The boiling point of an azeotrope is never equal to the boiling points of any of the components of the azeotrope.
Answer the following question:
The azeotropic solutions of two miscible liquids
Solutions which distill without any change in composition or temperature are called

Options

A. Saturated
B. Supersaturated
C. Ideal
D. Azeotrope

Explanation

To answer the question regarding the solutions that distill without any change in composition or temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Azeotropes**:
- Azeotropes are defined as solutions that boil at a constant temperature and maintain the same composition in both the liquid and vapor phases.

2. **Characteristics of Azeotropes**:
- Azeotropic mixtures cannot be separated by fractional distillation due to their unique boiling properties.
- They are typically formed by non-ideal solutions, where the interactions between the components differ from ideal behavior.

3. **Types of Azeotropes**:
- Solutions with negative deviation from Raoult's law form maximum boiling azeotropes.
- Solutions with positive deviation form minimum boiling azeotropes.

4. **Key Concept**:
- The boiling point of an azeotropic mixture is distinct and does not match the boiling points of the individual components.

5. **Identifying the Correct Term**:
- The question asks for the term that describes solutions which distill without any change in composition or temperature. Based on the definition and characteristics discussed, the correct term is "azeotropes".

### Final Answer:
The solutions which distill without any change in composition or temperature are called **azeotropes**.

---