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
`100 mL` of liquid `A` and `50 mL` of liquid `B` are mixed to form `138 mL` solution. It is

Options

A. Ideal solution
B. High boiling azeotrope
C. Low boiling azetrope
D. None of these

Explanation

To solve the problem regarding the azeotropic solutions of two miscible liquids, we will follow these steps:

### Step 1: Understand the Azeotropic Behavior
Azeotropes are solutions that boil at a constant temperature and have the same composition in both liquid and vapor phases. They cannot be separated by fractional distillation.

### Step 2: Analyze the Given Data
We have:
- Volume of liquid A = 100 mL
- Volume of liquid B = 50 mL
- Total expected volume if there was no volume change = 100 mL + 50 mL = 150 mL
- Actual volume of the solution = 138 mL

### Step 3: Determine the Volume Change
The observed volume (138 mL) is less than the expected volume (150 mL). This indicates that there is a volume contraction upon mixing, which is characteristic of solutions with negative deviation from Raoult's law.

### Step 4: Identify the Type of Azeotrope
Since the solution shows a negative deviation, it forms a maximum boiling azeotrope. This means that the boiling point of the azeotropic mixture is higher than the boiling points of the individual components.

### Step 5: Conclusion
The azeotropic mixture of the two miscible liquids A and B exhibits maximum boiling behavior due to negative deviation from ideality.

### Final Answer
The azeotropic solution formed by mixing 100 mL of liquid A and 50 mL of liquid B is a maximum boiling azeotrope.

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